State of the Planet

News from the Columbia Climate School

Ellesmere Island

  • 400 ppm World, Part 1: Large Changes Still to Come

    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.

  • Under Arctic Ice: Watch the Video

    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.

Blue banner with kids and Earth photos. Text: "Lamont-Doherty Earth Observatory Open House, Saturday, October 17, 2026, 10am-4pm.

On Saturday, October 17, 2026 from 10am to 4pm, Lamont-Doherty Earth Observatory Open House—our biggest, best science fun and discovery event of the year—will take place on our beautiful campus in Palisades, NY. Mark your calendar and join us for this free, family-friendly celebration of science! RSVP Today!

  • 400 ppm World, Part 1: Large Changes Still to Come

    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.

  • Under Arctic Ice: Watch the Video

    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.