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Plastic pollution, overfishing, and climate change are all taking an enormous toll on the planet’s life-support system. The oceans are acidifying, sea levels are rising, and coral reefs home to myriad fish species are dying.

But it’s not all doom and gloom.

Continue reading . . . . 

http://www.takepart.com/photos/technologies-are-helping-save-oceans/?cmpid=ait-fb

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Watch a clip about the water cycle.

This fast paced animation takes viewers through the water cycle.

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Animated diagram of the nitrogen cycle.

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Watch a video about the Earth's atmosphere.

Gases essential to life are explored through the history of the atmosphere.

Earth the Biography: Atmosphere : 
MON JULY 14 9P et/pt :
http://channel.nationalgeographic.com...

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Find out about Earth’s past climates including ice ages

Click on the tabs "Past climates: Slower changes" and "Past climates: Faster changes" to find out more about how and why Earth’s climate has changed.

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Find out how icebergs form
Click on "The climate of science" and then "Ice Gallery". Click on the other links to follow the work of a group of scientists on an expedition in Antarctica.

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Find out about the Sahara desert in northern Africa

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