A Fresh Future: Crash Course Kids #33.2 - By Crash Course Kids
Transcript
| 00:09 | I'm here to tell you not to panic , just | |
| 00:12 | keep calm . If you watch the last episode , | |
| 00:14 | you might be a little worried because I told you | |
| 00:16 | that of all the fresh water on earth , less | |
| 00:18 | than 1% of it is actually accessible to us on | |
| 00:21 | the surface and we are using it like we've got | |
| 00:23 | an unlimited supply , which you know , we don't | |
| 00:27 | . But even though humans are partly to blame for | |
| 00:29 | the freshwater problems on our planet , some of us | |
| 00:31 | are working on solutions to fix the damage freshwater systems | |
| 00:34 | around the world . But how exactly have humans affected | |
| 00:37 | the amount of fresh water in the hydro sphere ? | |
| 00:39 | And what are we doing to make things better ? | |
| 00:42 | Yeah , well , I'm glad you asked last time | |
| 00:48 | we took a look at the falling levels of fresh | |
| 00:49 | water in the Colorado River and the impact that had | |
| 00:52 | on local wildlife . So , you know that fresh | |
| 00:54 | water levels can definitely change , but you might not | |
| 00:57 | know exactly what causes them to change . Probably the | |
| 01:00 | biggest thing that humans do that negatively affects the hydro | |
| 01:03 | sphere is overharvesting . Overharvesting is when people use too | |
| 01:06 | much water , like on farms or factories or for | |
| 01:09 | personal use in their homes or offices , basically overharvesting | |
| 01:13 | is overuse pollution is another problem . When sewage or | |
| 01:17 | other waste from humans gets into the water , it | |
| 01:19 | can have a major impact on the animals that depend | |
| 01:22 | on it to survive . In some really bad cases | |
| 01:25 | , these animals can get sick or even die from | |
| 01:27 | living in contaminated water . Dams are the things that | |
| 01:30 | humans build on rivers that can also reduce the level | |
| 01:32 | of freshwater . They're used to collect water from rivers | |
| 01:34 | so that it can be redirected to different places . | |
| 01:37 | But dams also keep rivers from running their full natural | |
| 01:40 | course , cutting off the natural flow of a river | |
| 01:42 | can affect the quality of the water and also get | |
| 01:45 | in the way of the fish that migrate up and | |
| 01:46 | down rivers . Okay , now , at this point | |
| 01:48 | , you're probably thinking , come on Sabrina , get | |
| 01:50 | to the happier stuff . Well , there are ways | |
| 01:52 | to help conserve earth's freshwater . Lots of them . | |
| 01:55 | But let's not just talk about how people are helping | |
| 01:57 | to protect our water supply . Let's actually see some | |
| 02:01 | results . Well , first visit a freshwater system that's | |
| 02:08 | bouncing back from some tough times thanks to some helpful | |
| 02:10 | humans . This is L . A . River in | |
| 02:12 | olympic National Park in Washington state . It's looking good | |
| 02:15 | , right . Yeah . Well , it didn't always | |
| 02:18 | look that way though . A giant dam built nearly | |
| 02:20 | 100 years ago brought a lot of problems to the | |
| 02:23 | L . Y . All five species of native pacific | |
| 02:26 | salmon live in this river , but the damn kept | |
| 02:28 | them from making their usual migration along the river every | |
| 02:30 | year . With less river space to call home salmon | |
| 02:33 | numbers in the L Wall began to drop . Other | |
| 02:35 | fish were affected by the dam to because the water | |
| 02:37 | around the dam stayed in one place for longer than | |
| 02:39 | normal , the water got warmer than the fish were | |
| 02:41 | used to . This was a problem for two reasons | |
| 02:44 | . One most fish prefer to lay their eggs in | |
| 02:46 | cold water and to warm water breeds parasites , which | |
| 02:50 | led to more disease in the fish and which led | |
| 02:54 | to fewer fish as the years went on . So | |
| 02:56 | in 2011 , some local people decided it was time | |
| 02:58 | for the dam to come down and by early 2012 | |
| 03:01 | it was gone and the work to fix the L | |
| 03:03 | . Wa . Was underway . Since the dam has | |
| 03:04 | come down , almost 160 kilometers of habitat have been | |
| 03:08 | restored for the salmon species in the river . And | |
| 03:10 | today the L was looking awfully lovely . Plus it's | |
| 03:12 | not the only river getting a new look since 1999 | |
| 03:16 | about 430 dams have been torn down across the United | |
| 03:19 | States , allowing rivers to return to their natural flows | |
| 03:21 | , removing dams isn't the only thing humans are doing | |
| 03:24 | to pitch in groups have set aside some freshwater systems | |
| 03:26 | as protected areas to keep them from being polluted or | |
| 03:29 | over harvested . And you can help by doing really | |
| 03:31 | , really , really simple things like taking shorter showers | |
| 03:34 | are turning off the faucet when you brush your teeth | |
| 03:36 | . The L was still has a long way to | |
| 03:38 | go before it's fully restored . But if supercool humans | |
| 03:40 | keep pitching in , it might get there one day | |
| 03:46 | . So while some humans in the biosphere do pollute | |
| 03:50 | and over harvest our freshwater , some are doing everything | |
| 03:53 | they can to protect the hydro sphere water you waiting | |
| 03:56 | for , get out there and save some water . |
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