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NASA : le climat

NASA : le climat
Hide SubjectsBrowse by Subject Lemur moms and climate change. Planet Health Report Air Temperature Sea Ice Sea Level Earth's atmosphere now has 397 parts of carbon dioxide for every million parts of air. What does this number mean?

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The Kids Guide To Global Warming People are seeing change all over the world. Arctic sea ice is melting earlier and forming later. Glaciers are disappearing. Heat waves, storms and floods are becoming more extreme. Insects are emerging sooner and flowers are blooming earlier. In some places, birds are laying eggs before they’re expected and bears have stopped hibernating. BUILDING BIG: Home Page Explore large structures and what it takes to build them with BUILDING BIG™, a five-part PBS television series and Web site from WGBH Boston. Here are the main features of the site: Bridges, Domes, Skyscrapers, Dams, and Tunnels. The Labs Try your hand at our interactive engineering labs.

National Geographic First Mammal Species Goes Extinct Due to Climate Change The humble Bramble Cay melomys has disappeared from its island in the Great Barrier Reef. Climate Change Making Calendars Run Amok People in Central Asia are recalibrating their system of time to adapt to a changing ecosystem. The Great Energy Challenge The National Geographic initiative is a call to action to become actively involved, to learn more and do more—to change how we think about and consume energy so that we can all help tackle the big energy questions. U.S.'s First Official Climate Refugees Race Against Time A Native American tribe struggles to hold on to their culture while their land slips into the Gulf of Mexico. Crocodiles and Palm Trees in the Arctic?

Clean Air Kids: Greenhouse Effect & Global Warming The Earth is wrapped in a blanket of air called the 'atmosphere', which is made up of several layers of gases. The sun is much hotter than the Earth and it gives off rays of heat (radiation) that travel through the atmosphere and reach the Earth. The rays of the sun warm the Earth, and heat from the Earth then travels back into the atmosphere. The gases in the atmosphere stop some of the heat from escaping into space. These gases are called greenhouse gases and the natural process between the sun, the atmosphere and the Earth is called the 'Greenhouse Effect', because it works the same way as a greenhouse. The windows of a greenhouse play the same role as the gases in the atmosphere, keeping some of the heat inside the greenhouse.

Lawrence Hall of Science - 24/7 Science How fast does the wind blow? What makes things sticky? Where do insects live and plants grow? What is the best way to clean up the environment? A Student's Guide to Global Climate Change Our world is always changing. Look out your window long enough, and you might see the weather change. Look even longer, and you'll see the seasons change. The Earth's climate is changing, too, but in ways that you can't easily see. ESchoolToday: Ozone depletion Introduction: All about Ozone Like other environmental problems, Ozone Depletion is one that is very troubling, and rightly so, considered as a major environmental issue by all nations on the earth. Have you ever felt the sun's intensity ripping through your skin on a hot afternoon? Probably so. But the sun is no where near the earth. The sun is estimated to be about 150 million kilometers (93 million miles) from our planet earth.

Animal Web Cams The National Zoo is home to 2,000 individual animals of nearly 400 different species. Our best known residents are our giant pandas, but great apes, big cats, Asian elephants, birds, amphibians, reptiles, insects, aquatic animals, small mammals, and many others can be found at the Zoo. You can take a virtual visit to the Zoo any day of the week by tuning into our live web cams, which feature many of the Zoo's animals.

ESchoolToday: Climate Change Introduction to Climate change Many people make Climate Change and Global Warming a scary and difficult thing to understand, but it’s not. Scientists have warned that the world's climate has changed a lot, and has affected many living and non-living things. Many places that were warmer are now getting colder, and many colder regions are getting much colder or even warmer (know as Global Warming). For example, between 1901 and 2012, it is believed that the earth's temperature has risen by 0.89 °C.

Alessondra's OKC Great Horned Owl-Cam, Ustream.TV: Welcome to Alessondra's Great Horned Owl Cam, Live from Oklahoma City Alessondra's thrilled that you've Welcome to Alessondra's Great Horned Owl Cam, Live from Oklahoma City. OKC Owl Cam Site NavigationNest News | In The NewsFAQ | Glossary | Chat Info | Past Nest Info Mrs. Global warming see Global warming/temp for a proposed change in the layout of this entry Global warming is the increase over time of the average temperature of Earth's atmosphere and oceans. In the twentieth century land-based thermometers have recorded such a warming from the 1880s to about 1940, followed by cooling from 1940 to 1975, and another period of warming from 1975 to present (see graph ( The fluctuation in surface temperature is acknowledged by all scientists although the causes remain controversial -- see 'Historical temperature record', 'Urban heat islands' and 'Evidence against a warming period' below. Scientific opinion The climate system varies both through natural, "internal" processes as well as in response to variations in "external forcing" from both human and non-human causes, including changes in solar activity and volcanic emissions as well as greenhouse gases.

Migration of Birds Northern Prairie Wildlife Research Center General Considerations While certain flight directions are consistently followed by migratory birds, it is well to remember that the term "migration route" is a generalization, a concept referring to the general movements of a species, rather than an exact course followed by individual birds or a path followed by a species characterized by specific geographic or ecological boundaries. Even the records of banded birds usually show no more than the places of banding and recovery, and the details of the route actually traversed between the two points is interpolated. In determining migration routes, one must also constantly guard against the false assumption that localities with many grounded migrants are on the main path of migration and localities where no migrants are observed are off the main path.

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