Ellesmere Island
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400 ppm World, Part 1: Large Changes Still to Come
Why should society care that CO2 is now as high as 400 ppm? The reasons are multiple, but all trace back to the relationship between CO2 and temperature.
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Under Arctic Ice: Watch the Video
The video depicts the activities of the LDEO Switchyard field team, which deploys annually and uses ski-equipped aircraft to reach a series of sample sites between the North Pole and Ellesmere Island in Canada.

The first Earth Day in 1970 ignited a movement to stop polluting our planet. This Earth Month, join us in our commitment to realizing a just and sustainable future for our planet. Visit our Earth Day website for ideas, resources, and inspiration.