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<!doctype html>     <html class="no-js" lang="en">  <head> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta charset="utf-8"> <title>Home | NASA Climate Kids</title> <meta name="description" content=""> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="twitter:card" content="summary_large_image"> <meta name="twitter:site" content="@NASAClimate"> <meta name="twitter:title" content="Home"> <meta name="twitter:description" content=""> <meta name="twitter:image" content=""> <meta property="og:image" content=""> <meta property="og:site_name" content="NASA Climate Kids"> <meta property="og:description" content=""> <meta property="og:title" content="Home"> <meta property="og:type" content="article"> <link href="https://fonts.googleapis.com/css?family=Short+Stack" rel="stylesheet" type="text/css"> <link rel="stylesheet" href="/css/global.css?v=16">  <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon"> <link rel="icon" href="/favicon.ico" type="image/x-icon"> <script> var pageSpecificScript; </script> <script src="/js/libs/modernizr-2.5.3.min-ck.js"></script> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-5F4ZTSL');</script> </head> <body> <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-5F4ZTSL" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript> <div id = "top-wrapper"> <header> <div id = "nasa-header"> <div class = "container"> <a href = "https://www.nasa.gov"><img src = "/resources/site/nasa_logo.png" alt="NASA Logo"></a> <a href = "/"><img src = "/resources/site/header_image.png" class="siteHeaderLogo" alt="NASA Climate Kids header image"></a> <div id = "search"> <input type = "search" placeholder="SEARCH CLIMATE KIDS" name = "search" aria-label="Search"> </div> </div> </div> <div class="clearfix"></div> <div id = "top-nav"> <a href = "/menu/big-questions/" class="topNavIconHolder"><img src="/resources/site/menu_bigquestions.png" class="topNavIcon" alt="Illustration of a question mark that links to the Climate Kids Big Questions menu."><div class="topNavText">Big Questions</div></a> <div class="topNavBuffer"></div> <a href = "/menu/weather-and-climate/" class="topNavIconHolder"><img src="/resources/site/menu_weatherclimate.png" class="topNavIcon" alt="Illustration of a snowflake that links to the Climate Kids Weather & Climate menu."><div class="topNavText">Weather & Climate</div></a> <div class="topNavBuffer"></div> <a href = "/menu/atmosphere/" class="topNavIconHolder"><img src="/resources/site/menu_atmosphere.png" class="topNavIcon" alt="Illustration of a cloud that links to the Climate Kids Atmosphere menu."><div class="topNavText">Atmosphere</div></a> <div class="topNavBuffer"></div> <a href = "/menu/water/" class="topNavIconHolder"><img src="/resources/site/menu_water.png" class="topNavIcon" alt="Illustration of water waves that links to the Climate Kids Water menu."><div class="topNavText">Water</div></a> <div class="topNavBuffer"></div> <a href = "/menu/energy/" class="topNavIconHolder"><img src="/resources/site/menu_energy.png" class="topNavIcon" alt="Illustration of windmills that links to the Climate Kids Energy menu."><div class="topNavText">Energy</div></a> <div class="topNavBuffer"></div> <a href = "/menu/plants-and-animals/" class="topNavIconHolder"><img src="/resources/site/menu_plantsanimals.png" class="topNavIcon" alt="Illustration of a leaf that links to the Climate Kids Plants & Animals menu."><div class="topNavText">Plants & Animals</div></a> </div> <div class="clearfix"></div> </header> <div id = "main" role="main"> <div id = "featured-content"> <div class = "slide-wrapper"> <div class = "slide-container"> <div class="slide"> <a href="/cubesat-builder-game/"> <img src="/resources/icons/cubesat-builder-game.jpg" alt="A gamebox cover for the game CubeSat Builder. An engineer is running around a clean room holding a CubeSat box."> <div class="ribbon"> <h2>CubeSat Builder: Build a NASA Spacecraft!</h2> </div> <div class="indexSliderCTA">Click to Play!</div> </a> </div> <div class="slide"> <a href="/kids-guide-to-climate-change/"> <img src="/resources/icons/kids-guide-to-climate-change.png" alt="Illustration of Earth and a thermometer."> <div class="ribbon"> <h2>A Guide to Climate Change for Kids</h2> </div> <div class="indexSliderCTA">Click to Read More</div> </a> </div> <div class="slide"> <a href="/whats-in-the-atmosphere/"> <img src="/resources/icons/whats-in-the-atmosphere.jpg" alt="Illustration of the layers of Earth's atmosphere."> <div class="ribbon"> <h2>What's in the Atmosphere?</h2> </div> <div class="indexSliderCTA">Click to Read More</div> </a> </div> <div class="slide"> <a href="/climate-change-meaning/"> <img src="/resources/icons/climate-change-meaning.png" alt="Alaska's Muir glacier in August 1941 and August 2004."> <div class="ribbon"> <h2>What Is Climate Change?</h2> </div> <div class="indexSliderCTA">Click to Read More</div> </a> </div> <div class="slide"> <a href="/greenhouse-effect/"> <img src="/resources/icons/greenhouse-effect.png" alt="Illustration of the Earth inside a greenhouse."> <div class="ribbon"> <h2 >What Is the Greenhouse Effect?</h2> </div> <div class="indexSliderCTA">Click to Read More</div> </a> </div> <div class="slide"> <a href="/weather-climate/"> <img src="/resources/icons/weather-climate.jpg" alt="an illustration showing Earth in space."> <div class="ribbon"> <h2 >Weather or Climate?</h2> </div> <div class="indexSliderCTA">Click to Read More</div> </a> </div> </div> </div> </div> <div id="vitalSignsTabsHolder"> <div id="vitalSignsTabs"> <div id="vitalSignsTabCarbonDioxide" class="vitalSignsTab vitalSignsTabSelected"> <div class="vitalSignsTabArrow vitalSignsTabArrowUp"></div> <div class="vitalSignsTabText">CARBON<br>DIOXIDE</div> </div> <div id="vitalSignsTabGlobalTemperature" class="vitalSignsTab"> <div class="vitalSignsTabArrow vitalSignsTabArrowUp"></div> <div class="vitalSignsTabText">GLOBAL<br>TEMPERATURE</div> </div> <div id="vitalSignsTabSeaIce" class="vitalSignsTab"> <div class="vitalSignsTabArrow vitalSignsTabArrowDown"></div> <div class="vitalSignsTabText">SEA ICE</div> </div> <div id="vitalSignsTabSeaLevel" class="vitalSignsTab"> <div class="vitalSignsTabArrow vitalSignsTabArrowUp"></div> <div class="vitalSignsTabText">SEA LEVEL</div> </div> <div class="clearfix"></div> </div> <div id="vitalSignsContent"> <div id="vitalSignsContentText">Earth's atmosphere now has <span class="vitalSignsTextRed">426</span> parts of Carbon Dioxide<br>for every million parts of air.</div> <div id="vitalSignsContentIcon" class="vitalSignsIconCarbonDioxide"></div> <div class="clearfix"></div> </div> </div> <div class="clearfix"></div> <div id="indexFeaturedItems"> <a href = "/why-earth/"> <div class="indexFeaturedItem"> <img src="/resources/icons/why-earth.png" alt="Image of the Earth."/> <div class="indexFeaturedItemText">Why does NASA study Earth?</div> </div> </a> <div class="indexFeaturedItemBuffer"></div> <a href = "/tree-rings/"> <div class="indexFeaturedItem"> <img src="/resources/icons/tree-rings.png" alt="Image of a trail through a forest."/> <div class="indexFeaturedItemText">What can trees tell us about climate change?</div> </div> </a> <div class="indexFeaturedItemBuffer"></div> <a href = "/food/"> <div class="indexFeaturedItem"> <img src="/resources/icons/food.png" alt="Image of various vegetables, including green onions, radishes and yellow bell peppers."/> <div class="indexFeaturedItemText">Why does NASA care about food?</div> </div> </a> </div> <div class="clearfix"></div> <div id="indexBottomNavItems"> <a href = "/menu/play/"> <div class="indexBottomNavItem"> <img src="/resources/site/bottomnav_games.png" alt="Illustration of a video game controller."/> <div class="indexBottomNavItemText">Games</div> </div> </a> <div class="indexBottomNavItemBuffer"></div> <a href = "/menu/make/"> <div class="indexBottomNavItem"> <img src="/resources/site/bottomnav_activities.png" alt="Illustration of scissors."/> <div class="indexBottomNavItemText">Activities</div> </div> </a> <div class="indexBottomNavItemBuffer"></div> <a href = "/menu/dream/"> <div class="indexBottomNavItem"> <img src="/resources/site/bottomnav_people.png" alt="Illustration of stars."/> <div class="indexBottomNavItemText">People</div> </div> </a> <div class="indexBottomNavItemBuffer"></div> <a href = "/menu/watch/"> <div class="indexBottomNavItem"> <img src="/resources/site/bottomnav_videos.png" alt="Illustration of a video camera."/> <div class="indexBottomNavItemText">Videos</div> </div> </a> <div class="indexBottomNavItemBuffer"></div> <a href = "/climate-change-meaning/"> <div class="indexBottomNavItem"> <img src="/resources/site/bottomnav_mystery.png" alt="Illustration of a question mark."/> <div class="indexBottomNavItemText">Mystery</div> </div> </a> </div> <div class="clearfix"></div> <div class = "push"></div> </div> </div> <footer> <div class = "container"> <div class="footerSiteMap"> <div class="footerSiteMapColumn footerSiteMapColumn1"> <p class="footerSiteMapHeader"><strong>Big Questions</strong></p> <a href="/climate-change-meaning/"><p>What does global climate change mean?</p></a> <a href="/carbon/"><p>What is the big deal with carbon?</p></a> <a href="/greenhouse-effect/"><p>What is the greenhouse effect?</p></a> <a href="/climate-change-evidence/"><p>How do we know the climate is changing?</p></a> <a href="/ocean/"><p>What is happening to the oceans?</p></a> <a href="/nasa-research/"><p>What else do we need to find out?</p></a> </div> <div class="footerSiteMapColumn footerSiteMapColumnRest"> <p class="footerSiteMapHeader"><strong>Weather & Climate</strong></p> <a href="/menu/weather/"><p>Weather</p></a> <a href="/menu/climate/"><p>Climate</p></a> </div> <div class="footerSiteMapColumn footerSiteMapColumnRest"> <p class="footerSiteMapHeader"><strong>Atmosphere</strong></p> <a href="/menu/air/"><p>Air</p></a> <a href="/menu/carbons-travels/"><p>Carbon</p></a> <a href="/menu/greenhouse-gases/"><p>Greenhouse gases</p></a> </div> <div class="footerSiteMapColumn footerSiteMapColumnRest"> <p class="footerSiteMapHeader"><strong>Water</strong></p> <a href="/menu/ocean/"><p>Oceans</p></a> <a href="/menu/fresh-water/"><p>Rivers</p></a> <a href="/menu/fresh-water/"><p>Lakes</p></a> </div> <div class="footerSiteMapColumn footerSiteMapColumnRest"> <p class="footerSiteMapHeader"><strong>Energy</strong></p> <a href="/menu/renewable-energy/"><p>Renewable energy</p></a> <a href="/menu/fossil-fuels/"><p>Fossil fuels</p></a> </div> <div class="footerSiteMapColumn footerSiteMapColumnRest"> <p class="footerSiteMapHeader"><strong>Plants & Animals</strong></p> <a href="/menu/plants/"><p>Plants</p></a> <a href="/menu/animals/"><p>Animals</p></a> </div> <div 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