Climate Change: Crash Course Kids #41.2 - By Crash Course Kids
Transcript
| 00:0-1 | Hey , what's the difference between weather and climate ? | |
| 00:02 | You can't weather a tree , but you can climate | |
| 00:17 | , but you already know the difference between weather and | |
| 00:19 | climate and if it slipped your mind , the definitions | |
| 00:23 | are right there , you know that the weather can | |
| 00:25 | change quickly , but climate can also change just more | |
| 00:28 | slowly . And if you're good at putting two and | |
| 00:30 | two together and I know you are you probably already | |
| 00:33 | noticed that we use some of the same words when | |
| 00:35 | we talk about climate and environment . Words like temperature | |
| 00:38 | and rainfall , coincidence , I think not what science | |
| 00:42 | demands . Evidence , my friends and while we've already | |
| 00:44 | seen that living things can change when environments change , | |
| 00:47 | We need to ask how might a change in climate | |
| 00:51 | affect an ecosystem . Yeah . First , let's talk | |
| 00:57 | climates through little niece travels . We found out that | |
| 01:00 | Yuma Arizona had a hot and sunny climate . We | |
| 01:03 | decided this after finding out that although it rained once | |
| 01:06 | or twice during my long state , most of the | |
| 01:08 | days were hot and dry . Now the plants and | |
| 01:11 | animals that live in humans , hot , dry , | |
| 01:13 | sunny climate have adaptations that help them live in that | |
| 01:16 | desert environment . If we took a hike around huma | |
| 01:19 | , we might see a cactus and if we took | |
| 01:20 | a closer and careful look at the cactus , we'd | |
| 01:23 | see that it's outside is kind of waxy and tough | |
| 01:25 | . This adaptation helps the cactus save water by keeping | |
| 01:28 | the water from evaporating into the dry air . Now | |
| 01:31 | say something happened to humans . Climate save over the | |
| 01:34 | course of about 20 years , there were even hotter | |
| 01:36 | days and less rainfall than before . When weather patterns | |
| 01:39 | change over a long period of time we call it | |
| 01:42 | . Climate change , with the cactuses adaptations be enough | |
| 01:45 | . Then let's find out . Mm . Let's look | |
| 01:51 | at some organisms that are part of a desert ecosystem | |
| 01:54 | . We have our friend of cactus , a kangaroo | |
| 01:56 | rat , a rattlesnake in a desert fox . We | |
| 01:59 | can use the handy dandy food chain model to see | |
| 02:02 | how energy flows between living things in this ecosystem , | |
| 02:04 | it would probably look something like this . The cactus | |
| 02:07 | mix energy by photosynthesis and the energy goes from the | |
| 02:10 | cactus to the rat then to the snake and then | |
| 02:13 | to the fox . Now , although the cactus has | |
| 02:15 | adaptations that help its store and save water , it | |
| 02:18 | still needs rain . If it doesn't get enough in | |
| 02:20 | a drier climate , it's not going to have anything | |
| 02:22 | to store and it's not going to be able to | |
| 02:24 | survive . And you know what happens when we take | |
| 02:25 | out the bottom of the food chain , It's like | |
| 02:27 | taking the wrong block and Jenga . We throw the | |
| 02:30 | rest of the ecosystem off balance , but that's not | |
| 02:32 | the only problem . Less rain and hotter temperatures mean | |
| 02:35 | less water to drink for all of the animals and | |
| 02:38 | although they have adaptations to like scales to help them | |
| 02:40 | retain water that won't be enough to let them fit | |
| 02:43 | into a much hotter and drier climates and globally the | |
| 02:46 | climate is changing . Scientists who study climate change think | |
| 02:49 | that it's caused in part by changes to the earth's | |
| 02:51 | atmosphere , an increase in gases like carbon dioxide is | |
| 02:55 | trapping more heat close to the earth , acting like | |
| 02:57 | a blanket and making the earth warmer . But scientists | |
| 03:00 | are hard at work trying to find solutions to climate | |
| 03:03 | change . For example , they're looking at ways to | |
| 03:05 | keep too much carbon dioxide from entering the atmosphere . | |
| 03:13 | So all living things that make up the earth's biosphere | |
| 03:16 | have adaptations , characteristics that help them fit into their | |
| 03:18 | environment . Long term changes in the earth's weather patterns | |
| 03:21 | called climate change may have effects on the living things | |
| 03:24 | that make up ecosystems . Now . If only I | |
| 03:26 | could change that joke I told at the beginning of | |
| 03:28 | this video |
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