1 00:00:14,701 --> 00:00:18,301 On a river in the American Pacific Northwest... 2 00:00:20,821 --> 00:00:25,301 ...the yearly salmon run has collided with the modern world. 3 00:00:46,621 --> 00:00:50,901 This floodplain used to be easy passage for fish on a mission. 4 00:00:53,181 --> 00:00:57,341 But a road has turned it into a deadly gamble. 5 00:01:03,461 --> 00:01:05,821 The salmon must take their chances... 6 00:01:07,141 --> 00:01:10,021 ...to reach their spawning grounds upstream. 7 00:01:14,981 --> 00:01:17,981 They are driven by an overwhelming instinct 8 00:01:17,981 --> 00:01:20,101 to swim against the current. 9 00:01:21,661 --> 00:01:24,701 So they've just gotta go. 10 00:01:51,661 --> 00:01:53,781 And where one succeeds... 11 00:01:55,101 --> 00:01:56,541 others can too. 12 00:02:44,981 --> 00:02:50,221 Millions of migrating salmon must today run a treacherous gauntlet. 13 00:02:52,461 --> 00:02:53,861 From the open ocean... 14 00:02:57,621 --> 00:03:02,821 ...inland past tarmac, concrete, and steel... 15 00:03:09,221 --> 00:03:13,701 ...these determined travelers will stop at nothing to reach their goal. 16 00:03:18,021 --> 00:03:19,261 If they succeed, 17 00:03:19,781 --> 00:03:25,661 their migration will bring a pulse of vital nutrients in their bodies 18 00:03:26,741 --> 00:03:32,581 that nourishes a vast forest network that spans the Pacific Northwest. 19 00:03:41,501 --> 00:03:42,781 To stay healthy, 20 00:03:43,821 --> 00:03:48,021 this forest and everything that depends on it... 21 00:03:51,741 --> 00:03:53,941 ...needs its fish. 22 00:03:56,581 --> 00:03:58,941 And these heroic salmon 23 00:03:58,941 --> 00:04:03,261 are just one in a cast of incredible creatures 24 00:04:03,261 --> 00:04:05,101 all over the world... 25 00:04:07,261 --> 00:04:09,301 ...whose battles to survive... 26 00:04:11,461 --> 00:04:14,821 ...adapt, and reproduce 27 00:04:15,421 --> 00:04:21,821 also have the power to help nurse our ailing planet back to health. 28 00:04:25,141 --> 00:04:31,421 They are our most powerful allies on the Earth's road to recovery. 29 00:04:33,701 --> 00:04:36,141 While they fight for their futures, 30 00:04:36,661 --> 00:04:41,261 they are in fact fighting for ours. 31 00:05:03,621 --> 00:05:04,621 Humans. 32 00:05:07,221 --> 00:05:09,901 We've done some strange things to this planet. 33 00:05:14,541 --> 00:05:17,781 By attempting to build our dream homes... 34 00:05:20,861 --> 00:05:24,661 ...we've created a confusing world for the neighbors. 35 00:05:29,781 --> 00:05:31,541 Wherever we've spread, 36 00:05:32,061 --> 00:05:36,541 the dangers we've introduced are causing havoc. 37 00:05:42,501 --> 00:05:47,101 But one creature has been preparing for the worst... 38 00:05:47,781 --> 00:05:49,301 his entire life. 39 00:05:54,021 --> 00:05:56,421 Hunkered down in his Florida bunker... 40 00:05:58,421 --> 00:06:00,821 the ultimate doomsday prepper. 41 00:06:04,741 --> 00:06:09,101 Inside a rock-hard shell six feet underground. 42 00:06:11,941 --> 00:06:13,901 Now that's how you stay safe. 43 00:06:22,061 --> 00:06:24,781 But even a recluse needs to eat. 44 00:06:29,101 --> 00:06:34,101 For a gopher tortoise, leaving your burrow may well be daunting. 45 00:06:37,581 --> 00:06:42,181 But to find fresh shoots, he needs to come out of his shell 46 00:06:42,701 --> 00:06:45,381 and out of his comfort zone. 47 00:06:51,501 --> 00:06:54,021 Come on, how scary can it be? 48 00:06:57,821 --> 00:06:59,101 Here goes nothing. 49 00:07:14,501 --> 00:07:16,501 The neighbors seem pretty harmless. 50 00:07:19,621 --> 00:07:24,861 All busy keeping Florida's longleaf pine forest in tip-top condition. 51 00:07:30,221 --> 00:07:31,101 Pollinators. 52 00:07:32,741 --> 00:07:33,821 Tree planters. 53 00:07:37,741 --> 00:07:39,461 Even pest controllers. 54 00:07:47,341 --> 00:07:50,821 But it's best to give some a wide berth. 55 00:08:04,021 --> 00:08:06,061 For our play-it-safe tortoise, 56 00:08:06,061 --> 00:08:09,101 coming out of his shell seems to have paid off... 57 00:08:13,861 --> 00:08:15,861 ...with a midsummer feast. 58 00:08:21,421 --> 00:08:24,181 But he can't let his guard down. 59 00:08:29,381 --> 00:08:32,021 Because high summer is also 60 00:08:33,061 --> 00:08:34,701 wildfire season. 61 00:08:38,341 --> 00:08:42,621 It's nature's way of making space for new life to grow. 62 00:08:51,461 --> 00:08:53,541 If he can't get back to his burrow, 63 00:08:54,301 --> 00:08:56,741 he'll be cooked in his own shell. 64 00:09:00,261 --> 00:09:02,621 Time to put the pedal to the metal. 65 00:09:19,461 --> 00:09:22,261 Burning at over 600 degrees... 66 00:09:24,861 --> 00:09:28,981 ...the fire claims an acre every ten seconds. 67 00:10:11,341 --> 00:10:12,421 Amazingly... 68 00:10:15,181 --> 00:10:16,941 the tortoise has survived. 69 00:10:19,141 --> 00:10:20,181 But how? 70 00:10:22,341 --> 00:10:23,941 He didn't make it home. 71 00:10:26,141 --> 00:10:29,861 But he has dug safety bunkers all over this forest. 72 00:10:32,421 --> 00:10:36,541 And his doomsday prepping hasn't just saved his own skin. 73 00:10:40,661 --> 00:10:45,581 Over 300 different species seek shelter from summer wildfires 74 00:10:45,581 --> 00:10:48,501 in the burrows of gopher tortoises. 75 00:10:57,901 --> 00:10:59,501 He has saved his neighbors. 76 00:11:01,221 --> 00:11:05,461 And as each animal plays its own role in the forest, 77 00:11:06,461 --> 00:11:09,781 together they'll help their home to recover. 78 00:11:15,061 --> 00:11:18,541 We will increasingly rely on heroes like him 79 00:11:18,541 --> 00:11:22,501 as the web of life on which we all depend... 80 00:11:24,181 --> 00:11:26,821 ...is threatened from all sides. 81 00:11:32,781 --> 00:11:34,061 In 2020, 82 00:11:35,741 --> 00:11:39,621 Australia suffered its worst ever bushfire season. 83 00:11:44,021 --> 00:11:48,221 One-fifth of all its forests turned to ash. 84 00:11:51,181 --> 00:11:54,381 Three billion animals killed or harmed. 85 00:11:57,861 --> 00:12:01,621 But there may yet be a way to heal this broken land. 86 00:12:09,981 --> 00:12:13,101 A flying fox descends on Downtown Sydney... 87 00:12:16,421 --> 00:12:18,781 ...with thousands of other fruit bats. 88 00:12:22,901 --> 00:12:29,221 Her forest destroyed, these refugees are trying to survive in a new home. 89 00:12:32,661 --> 00:12:36,821 This world is like no forest she's ever seen. 90 00:12:50,341 --> 00:12:52,261 A canopy of concrete. 91 00:12:56,181 --> 00:12:57,581 Electric branches. 92 00:13:00,301 --> 00:13:01,941 Razor blade undergrowth. 93 00:13:04,621 --> 00:13:11,061 Nothing in 50 million years of evolution has prepared her for this. 94 00:13:21,541 --> 00:13:23,141 But she's learning fast. 95 00:13:23,661 --> 00:13:26,981 And pinpoint night vision helps her find food 96 00:13:27,501 --> 00:13:29,541 even in the heart of the city. 97 00:13:40,541 --> 00:13:42,781 She must eat her fill before dawn. 98 00:13:48,541 --> 00:13:53,421 Because after the night shift, she's got a day job to clock on to. 99 00:14:01,461 --> 00:14:03,181 In a park nearby, 100 00:14:03,181 --> 00:14:06,861 what used to be a rest stop for migrating bats, 101 00:14:06,861 --> 00:14:09,901 has now become a permanent roost. 102 00:14:13,341 --> 00:14:15,941 Hiding something truly precious... 103 00:14:17,821 --> 00:14:21,901 her hungry baby waiting for his morning milk. 104 00:14:40,661 --> 00:14:43,541 But the day shift brings its own challenge. 105 00:14:47,021 --> 00:14:47,861 Heat. 106 00:14:52,261 --> 00:14:57,101 Sydney summers now regularly top 110 degrees. 107 00:15:00,541 --> 00:15:02,621 Far hotter than shaded forests. 108 00:15:05,821 --> 00:15:07,701 And deadly for young bats. 109 00:15:17,701 --> 00:15:20,621 But mom has some neat tricks up her sleeve. 110 00:15:23,421 --> 00:15:26,901 Blood flows through the thin skin of her wings 111 00:15:27,621 --> 00:15:29,621 so she can try to cool down. 112 00:15:34,021 --> 00:15:36,141 And she can fan her pup. 113 00:15:40,301 --> 00:15:42,981 But the temperature is still rising. 114 00:15:47,381 --> 00:15:48,461 He's in trouble. 115 00:15:50,741 --> 00:15:53,461 She must find a way to cool him down. 116 00:16:06,421 --> 00:16:08,421 There's one thing left to try. 117 00:16:12,101 --> 00:16:12,941 Water. 118 00:16:22,141 --> 00:16:24,501 It calls for a daredevil descent. 119 00:16:29,541 --> 00:16:31,421 The airspace is crowded... 120 00:16:35,501 --> 00:16:37,181 ...with fierce competition. 121 00:16:41,141 --> 00:16:43,461 But it's nothing she can't handle. 122 00:16:57,581 --> 00:17:00,341 A single dip soaks her fur. 123 00:17:04,461 --> 00:17:06,741 Enough water to cool her pup... 124 00:17:08,701 --> 00:17:11,661 ...with a soggy, life-saving embrace. 125 00:17:18,181 --> 00:17:24,021 Whatever this hostile place throws at her, she will do her best to find a way. 126 00:17:31,981 --> 00:17:35,661 And there's more than just her baby's survival at stake. 127 00:17:39,221 --> 00:17:44,381 Because fruit bats have the power to shape the world around them. 128 00:17:46,901 --> 00:17:52,741 Amazingly, each flying fox can pollinate 50 different species of tree... 129 00:17:56,341 --> 00:18:00,501 and spread thousands of seeds in a single night. 130 00:18:03,541 --> 00:18:06,301 Even here in Sydney's parks, 131 00:18:06,301 --> 00:18:10,341 there are signs that they are nursing nature back to health. 132 00:18:20,221 --> 00:18:24,741 Over time, if these bats can return to their wilderness home... 133 00:18:27,981 --> 00:18:30,901 ...this vast tree-planting air force... 134 00:18:32,541 --> 00:18:35,781 could help regrow their lost forest anew. 135 00:18:50,221 --> 00:18:53,181 The healthier the Earth's wild places, 136 00:18:54,101 --> 00:18:57,101 the harder they work to the benefit of us all... 137 00:19:02,621 --> 00:19:07,181 ...protecting the air we breathe and the water we drink. 138 00:19:13,341 --> 00:19:16,381 The future health of our entire planet 139 00:19:17,421 --> 00:19:21,461 may rest with nature's last great strongholds... 140 00:19:22,861 --> 00:19:26,421 ...and their most important inhabitants. 141 00:19:31,741 --> 00:19:35,221 This grandmother has a growing family to support. 142 00:19:39,301 --> 00:19:41,581 Every new baby, a blessing. 143 00:19:43,981 --> 00:19:47,061 But also another mouth to feed. 144 00:19:50,781 --> 00:19:54,541 Forest elephants have demanding nutritional needs. 145 00:19:56,261 --> 00:19:59,261 And there's only so much grass you can stomach. 146 00:20:02,821 --> 00:20:07,021 So, it's just as well she has Africa's biggest drugstore 147 00:20:07,021 --> 00:20:08,701 right on her doorstep. 148 00:20:11,021 --> 00:20:12,861 The Congo rainforest. 149 00:20:21,941 --> 00:20:26,741 Bulldozing their way through the dense undergrowth is slow-going. 150 00:20:29,181 --> 00:20:30,741 But there's a quicker way. 151 00:20:33,221 --> 00:20:34,061 A path. 152 00:20:38,421 --> 00:20:42,301 Generations of her ancestors have walked these same routes... 153 00:20:45,141 --> 00:20:49,421 creating thousands of miles of elephant-sized corridors... 154 00:20:53,301 --> 00:20:56,301 ...making it far easier to browse the aisles. 155 00:21:01,181 --> 00:21:03,381 And this path leads... 156 00:21:05,181 --> 00:21:07,141 ...to a forest pharmacy. 157 00:21:10,941 --> 00:21:14,181 The clay is rich in salts and minerals... 158 00:21:20,101 --> 00:21:23,141 that help them survive the sweltering heat. 159 00:21:26,021 --> 00:21:28,261 Like an isotonic mud drink. 160 00:21:34,261 --> 00:21:38,821 But to grow big and strong, this family needs fresh vitamins. 161 00:21:41,221 --> 00:21:44,861 And Grandma knows every trick in the book to find them. 162 00:21:50,421 --> 00:21:54,821 Elephants can hear some of the lowest frequencies 163 00:21:54,821 --> 00:21:56,101 of any animal. 164 00:22:02,981 --> 00:22:06,381 And they can even use the sensitive pads of their feet 165 00:22:06,381 --> 00:22:08,821 to pick up the faintest of tremors. 166 00:22:12,501 --> 00:22:17,261 And that is the sound of fresh fruit hitting the shop floor. 167 00:22:31,661 --> 00:22:33,421 Grandma has a bearing... 168 00:22:35,781 --> 00:22:38,141 and she knows the quickest route there. 169 00:22:49,501 --> 00:22:52,101 And in their quest for a healthy diet, 170 00:22:53,381 --> 00:22:55,301 wherever this family roams, 171 00:22:55,821 --> 00:22:58,661 they also boost the forest's health. 172 00:23:04,941 --> 00:23:11,141 Each elephant spreads over 200 pounds of mineral-rich compost... 173 00:23:14,061 --> 00:23:17,181 ...and weeds out several miles of choking undergrowth... 174 00:23:18,421 --> 00:23:20,141 ...every single day... 175 00:23:30,461 --> 00:23:33,621 ...which gives the forest's slow-growing saplings 176 00:23:33,621 --> 00:23:39,101 the chance they need to transform into giants. 177 00:24:01,461 --> 00:24:05,541 Giants with the power to help save us all. 178 00:24:11,101 --> 00:24:15,501 As humans drive up the amount of carbon dioxide in our atmosphere, 179 00:24:16,421 --> 00:24:21,501 this mighty elephant-grown tree is drawing it down. 180 00:24:23,661 --> 00:24:27,981 It then performs one of nature's greatest magic tricks. 181 00:24:31,181 --> 00:24:34,701 Transforming carbon dioxide into sugars 182 00:24:35,221 --> 00:24:38,101 through the power of sunlight on its leaves. 183 00:24:41,621 --> 00:24:45,061 Locking planet-warming carbon safely away 184 00:24:45,541 --> 00:24:49,421 into its branches, trunk, and roots. 185 00:24:54,501 --> 00:24:59,741 The work of gardening elephants allows Africa's tropical trees 186 00:24:59,741 --> 00:25:06,101 to draw down an extra billion tons of carbon every single year. 187 00:25:14,461 --> 00:25:19,621 These giants could help us turn the tide on rising carbon dioxide levels... 188 00:25:24,741 --> 00:25:27,101 ...and actually fight climate change. 189 00:25:33,701 --> 00:25:37,501 While Grandma simply searches for what she needs 190 00:25:37,501 --> 00:25:39,421 to keep her family healthy. 191 00:25:48,381 --> 00:25:50,261 But in the last 30 years, 192 00:25:50,781 --> 00:25:56,021 we have lost three-quarters of Africa's forest elephants to poaching. 193 00:26:00,541 --> 00:26:04,181 With so little of our planet's wilderness still intact, 194 00:26:05,021 --> 00:26:09,021 we need its wildlife now more than ever. 195 00:26:11,821 --> 00:26:17,421 Nature's greatest healers are disappearing on our watch. 196 00:26:22,781 --> 00:26:26,821 Species that do most for our planet's health 197 00:26:27,341 --> 00:26:30,581 are amongst those most at risk of extinction. 198 00:26:34,781 --> 00:26:39,941 And as everything is connected to the vast web of life, 199 00:26:41,021 --> 00:26:45,661 their fate could soon become ours. 200 00:26:50,301 --> 00:26:55,181 But what if we could help some of these vital animals... 201 00:26:56,701 --> 00:26:58,261 to rise again? 202 00:27:08,541 --> 00:27:09,901 Saiga antelope. 203 00:27:13,301 --> 00:27:18,501 They once roamed the steppe from Europe to China in their millions. 204 00:27:21,781 --> 00:27:25,221 Grazing and spreading seeds, 205 00:27:26,061 --> 00:27:30,101 these nomads maintained the world's biggest grassland 206 00:27:30,621 --> 00:27:31,541 for millennia. 207 00:27:35,901 --> 00:27:37,461 Until the 1990s, 208 00:27:39,501 --> 00:27:43,101 when rampant poaching devastated their herds. 209 00:27:47,221 --> 00:27:50,781 Their numbers fell faster than any mammals in history. 210 00:27:53,141 --> 00:27:55,381 And as the grazers disappeared, 211 00:27:57,061 --> 00:28:00,301 so too did the grasslands that depended on them. 212 00:28:20,221 --> 00:28:25,221 But a decade later, saiga hunting was banned throughout their range. 213 00:28:29,021 --> 00:28:33,501 The future of the steppe rested on whether a few survivors 214 00:28:33,501 --> 00:28:35,661 could come back from the brink. 215 00:28:42,061 --> 00:28:43,181 A new hope. 216 00:28:46,381 --> 00:28:49,541 And one becomes three. 217 00:29:02,461 --> 00:29:06,381 Tomorrow's grazers ready to roam. 218 00:29:09,741 --> 00:29:12,141 And thankfully, they are not alone. 219 00:29:14,741 --> 00:29:18,581 Other saiga mothers have gathered at the nursery grounds. 220 00:29:21,021 --> 00:29:24,301 At a year old, they give birth to twins, 221 00:29:25,461 --> 00:29:26,901 and even triplets. 222 00:29:32,701 --> 00:29:34,901 So with each yearly baby boom, 223 00:29:35,501 --> 00:29:38,141 the herds nearly double in size. 224 00:29:41,261 --> 00:29:43,421 In just 20 years, 225 00:29:43,421 --> 00:29:48,701 a few thousand survivors have become a force a million strong. 226 00:30:07,981 --> 00:30:12,581 This new generation is ready to reclaim their ancestral home. 227 00:30:16,581 --> 00:30:19,501 Marching for thousands of miles every year. 228 00:30:26,101 --> 00:30:30,101 Breathing life into the grassland wherever they spread. 229 00:30:34,701 --> 00:30:40,221 And securing the future of the steppe for everyone who lives here. 230 00:30:56,941 --> 00:31:03,141 Scientists have calculated that supporting the return of just 20 large mammal species 231 00:31:03,661 --> 00:31:08,701 could help revive nearly a quarter of all the land on Earth. 232 00:31:19,101 --> 00:31:25,021 So today, a movement is gathering pace across more than 70 countries worldwide... 233 00:31:27,981 --> 00:31:32,221 to hand damaged landscapes back to their natural caretakers 234 00:31:33,261 --> 00:31:36,261 in a process called "rewilding." 235 00:31:41,381 --> 00:31:47,181 In Argentina's Iberá Wetlands, over a million acres of swamps, forests, 236 00:31:47,181 --> 00:31:52,221 and grasslands once thronged with over 4,000 species. 237 00:31:55,101 --> 00:31:58,781 But centuries of cattle ranching drove out the wildlife 238 00:31:59,541 --> 00:32:03,741 leaving this rich tapestry at risk of collapse... 239 00:32:07,581 --> 00:32:09,341 ...until the turn of the millennium... 240 00:32:11,341 --> 00:32:14,341 when work began to hand this land back to nature. 241 00:32:21,621 --> 00:32:26,821 But now, one species is standing in the way of complete recovery. 242 00:32:34,661 --> 00:32:39,221 With the cattle gone, clans of capybara are filling the vacuum. 243 00:32:42,101 --> 00:32:44,101 Hundred-pound rodents... 244 00:32:46,381 --> 00:32:49,581 mowing down any new shoots that try to grow. 245 00:32:53,341 --> 00:32:56,941 Which means Iberá's recovery has hit the skids. 246 00:33:01,061 --> 00:33:04,061 Not that these giant guinea pigs seem worried. 247 00:33:07,101 --> 00:33:08,861 They're so laid back... 248 00:33:10,621 --> 00:33:12,061 ...they're horizontal. 249 00:33:16,261 --> 00:33:19,181 But all that is about to change. 250 00:33:28,821 --> 00:33:33,181 This pen holds one of South America's most feared predators... 251 00:33:35,461 --> 00:33:38,781 ...hunted out here over 70 years ago. 252 00:33:47,981 --> 00:33:52,061 This rescued jaguar could solve the capybara conundrum. 253 00:33:58,221 --> 00:34:01,901 While her challenge is feeding her twin daughters. 254 00:34:07,261 --> 00:34:11,941 Everything now hinges on whether this killer can learn to hunt... 255 00:34:15,421 --> 00:34:17,781 ...on the other side of the fence. 256 00:34:26,541 --> 00:34:32,101 The first free-roaming jaguars to set foot here since the 1950s. 257 00:34:45,341 --> 00:34:47,541 It's all theirs for the taking... 258 00:34:49,301 --> 00:34:52,701 if Mom can just tune into her killer Instinct. 259 00:35:10,621 --> 00:35:11,701 Stealth mode. 260 00:35:33,101 --> 00:35:34,141 Keep low. 261 00:35:48,221 --> 00:35:49,301 Get close. 262 00:36:13,461 --> 00:36:15,421 Then wait for your moment. 263 00:36:36,861 --> 00:36:40,181 These capybara have only ever danced to their own tune. 264 00:36:44,541 --> 00:36:45,461 Until now. 265 00:37:16,621 --> 00:37:19,061 Her daughters witness a masterclass 266 00:37:19,821 --> 00:37:21,861 and share the spoils. 267 00:37:23,941 --> 00:37:26,541 They too will become agents of change... 268 00:37:29,581 --> 00:37:32,981 ...unlocking the full potential of this vast landscape. 269 00:37:37,941 --> 00:37:43,421 This family of assassins will now bring fear wherever they tread. 270 00:38:04,861 --> 00:38:09,101 The capybara will keep to the waterways where they feel safer. 271 00:38:15,621 --> 00:38:20,301 Keeping grazers on the move gives more plants a chance to recover... 272 00:38:23,021 --> 00:38:25,901 so pockets of new habitat can emerge. 273 00:38:30,141 --> 00:38:34,421 And even more species can return to this old cattle ranch... 274 00:38:38,501 --> 00:38:43,941 ...building their own connections, making it more resilient to change. 275 00:38:51,741 --> 00:38:54,221 Iberá's restored webs of life 276 00:38:54,741 --> 00:38:58,421 will help it endure long into the future. 277 00:39:06,061 --> 00:39:09,861 Thanks to the return of one missing piece of the puzzle. 278 00:39:16,261 --> 00:39:18,741 Empowering nature's healers 279 00:39:18,741 --> 00:39:22,781 can protect us from many of the perils of a changing planet. 280 00:39:25,901 --> 00:39:29,221 Wildflower meadows boost bee populations... 281 00:39:32,261 --> 00:39:36,021 ...helping secure a quarter of our food supplies 282 00:39:36,021 --> 00:39:39,021 from increasingly unpredictable seasons. 283 00:39:43,261 --> 00:39:47,301 Protecting sea otters revives kelp forests... 284 00:39:49,901 --> 00:39:53,901 which shield coastlines from increasingly stormy seas. 285 00:40:00,741 --> 00:40:05,421 And rising whale numbers fertilize the oceans, 286 00:40:05,941 --> 00:40:09,021 helping to feed blooms of plankton 287 00:40:09,541 --> 00:40:13,981 that capture ten billion tons of carbon every year. 288 00:40:17,341 --> 00:40:20,621 As much as all our rainforests combined. 289 00:40:25,341 --> 00:40:29,141 When we help nature, nature helps us. 290 00:40:30,261 --> 00:40:34,981 The signs of a hopeful recovery are there to see. 291 00:40:40,021 --> 00:40:42,021 Across Washington State, 292 00:40:42,541 --> 00:40:45,541 the paths of the mighty salmon run are blocked 293 00:40:46,581 --> 00:40:49,701 by more than 10,000 man-made obstacles. 294 00:40:55,421 --> 00:41:00,421 Numbers of some salmon species have crashed by up to 95%. 295 00:41:06,381 --> 00:41:09,941 But as we begin to see the bigger picture, 296 00:41:11,781 --> 00:41:14,301 today on one river... 297 00:41:16,901 --> 00:41:19,061 things are about to change. 298 00:42:00,981 --> 00:42:03,941 A campaign to tear down old dams 299 00:42:03,941 --> 00:42:07,181 is transforming waterways across North America. 300 00:42:08,661 --> 00:42:12,701 So far, over 1,900 have been dismantled. 301 00:42:15,621 --> 00:42:20,421 Thousands of miles of rivers can once again run free. 302 00:42:24,061 --> 00:42:25,941 So too can their salmon. 303 00:42:37,421 --> 00:42:41,581 Finally, they can reach their ancestral spawning grounds. 304 00:42:51,661 --> 00:42:55,581 As they lay their eggs in the cool, shaded streams... 305 00:42:59,061 --> 00:43:00,861 their journey is complete. 306 00:43:05,261 --> 00:43:08,941 But their legacy will endure. 307 00:43:13,861 --> 00:43:17,301 An entire generation of salmon give up their bodies. 308 00:43:22,981 --> 00:43:27,701 And their death pumps life back into the forest. 309 00:43:40,021 --> 00:43:45,661 This vast transfer of nutrients from ocean to land, 310 00:43:46,501 --> 00:43:48,861 from one life to the next, 311 00:43:50,341 --> 00:43:52,621 is the forest's lifeblood... 312 00:43:57,061 --> 00:44:02,541 providing up to 80% of the nitrogen it needs to grow. 313 00:44:12,821 --> 00:44:16,581 The salmons' offspring will travel downstream 314 00:44:17,861 --> 00:44:19,781 to start their cycle anew. 315 00:44:22,621 --> 00:44:26,941 With our help, their numbers could flourish again, 316 00:44:27,981 --> 00:44:32,341 sustaining an entire web of connections... 317 00:44:34,741 --> 00:44:35,781 from mountain... 318 00:44:38,181 --> 00:44:39,261 ...to sea. 319 00:44:44,421 --> 00:44:47,741 Bringing new hope for everyone that relies on them. 320 00:44:58,821 --> 00:45:02,381 Nature can help heal our world... 321 00:45:07,261 --> 00:45:10,581 if we just give it a chance. 322 00:45:14,021 --> 00:45:19,701 Every living being is an invaluable link in the web of life... 323 00:45:22,701 --> 00:45:26,301 on which, ultimately, we all depend. 324 00:45:30,661 --> 00:45:35,301 In our connected world, every action has consequences. 325 00:45:38,781 --> 00:45:40,741 And the choices we make 326 00:45:41,901 --> 00:45:43,221 really matter. 327 00:45:46,141 --> 00:45:48,021 Armed with new knowledge, 328 00:45:48,541 --> 00:45:54,701 we can take steps to help nature nurse our planet back to health. 329 00:46:03,541 --> 00:46:04,981 The time to act 330 00:46:05,981 --> 00:46:07,061 is now. 331 00:46:11,501 --> 00:46:17,741 Because it's no longer just a case of whether we can still save nature, 332 00:46:19,181 --> 00:46:23,621 but whether nature can still save us.