State of the Planet

News from the Columbia Climate School

climate science30

  • Climate Change and the Future of Mono Lake

    Climate Change and the Future of Mono Lake

    Understanding the climate history of Mono Lake will help scientists understand the future impact of climate change. This is no esoteric question for Los Angeles, which depends in part on Mono Lake’s watershed for drinking water, green lawns, agriculture and industry.

  • When the Sahara Turned to Sand

    When the Sahara Turned to Sand

    The Sahara wasn’t always a desert. Trees and grasslands dominated the landscape from roughly 10,000 to 5,000 years ago. Then, abruptly, the climate changed. A study by Lamont-Doherty’s Peter deMenocal says it took just a few hundred years to happen.

  • Is Global Heating Hiding Out in the Oceans?

    Parts of Pacific Warming 15 Times Faster Than in Past 10,000 Years

  • James Hansen to Lead New Program on Climate Science and Policy

    A Focus on Practical Results

  • Q&A: Climate Change, Drought and the Future

    Q&A: Climate Change, Drought and the Future

    “One of the ways that climate change is going to manifest is through warmer temperatures. … What we are seeing, in line with our projections, is that even if you assume constant precipitation, the temperature effects are so large that it is going to dry things out. This is going to have really big impacts…

  • Strange Bedfellows in the Climate Change Saga: Taiga to Tundra

    Strange Bedfellows in the Climate Change Saga: Taiga to Tundra

    In the nine-hour drive on the great Dalton Highway to Toolik Field Station one starts out in the boreal forest, which is also called the “taiga,” but the forest eventually disappears. More accurately, trees disappear. Leaving Fairbanks, one drives through beautiful stands of spruce, birch, and aspen trees, but as one gets closer and closer…

  • Strange Bedfellows in the Climate Change Saga: The Quest for the Arctic Wolf

    Strange Bedfellows in the Climate Change Saga: The Quest for the Arctic Wolf

    When you travel northbound on Alaska’s famous Dalton Highway heading toward the Arctic Sea, the northern edge of the world, you carry a radio to communicate with the enormous rigs that roar along the road, the giant trucks made famous by the History Channel’s Ice Road Truckers. Radio messages between truckers and non-truckers are simple…

  • 400 ppm World, Part 2: Rising Seas Come with Rising CO2

    400 ppm World, Part 2: Rising Seas Come with Rising CO2

    Every indication is that thermal expansion will not dominate rates of sea-level rise in the future. As Earth’s climate marches toward equilibration with present-day CO2 levels, the climate will continue to warm. And this warming threatens the stability of a potentially much, much larger source for sea-level rise — the world’s remaining ice sheets.

  • 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.

Banner: Climate Week NYC 2025, September 21-28, 2025
  • Climate Change and the Future of Mono Lake

    Climate Change and the Future of Mono Lake

    Understanding the climate history of Mono Lake will help scientists understand the future impact of climate change. This is no esoteric question for Los Angeles, which depends in part on Mono Lake’s watershed for drinking water, green lawns, agriculture and industry.

  • When the Sahara Turned to Sand

    When the Sahara Turned to Sand

    The Sahara wasn’t always a desert. Trees and grasslands dominated the landscape from roughly 10,000 to 5,000 years ago. Then, abruptly, the climate changed. A study by Lamont-Doherty’s Peter deMenocal says it took just a few hundred years to happen.

  • Is Global Heating Hiding Out in the Oceans?

    Parts of Pacific Warming 15 Times Faster Than in Past 10,000 Years

  • James Hansen to Lead New Program on Climate Science and Policy

    A Focus on Practical Results

  • Q&A: Climate Change, Drought and the Future

    Q&A: Climate Change, Drought and the Future

    “One of the ways that climate change is going to manifest is through warmer temperatures. … What we are seeing, in line with our projections, is that even if you assume constant precipitation, the temperature effects are so large that it is going to dry things out. This is going to have really big impacts…

  • Strange Bedfellows in the Climate Change Saga: Taiga to Tundra

    Strange Bedfellows in the Climate Change Saga: Taiga to Tundra

    In the nine-hour drive on the great Dalton Highway to Toolik Field Station one starts out in the boreal forest, which is also called the “taiga,” but the forest eventually disappears. More accurately, trees disappear. Leaving Fairbanks, one drives through beautiful stands of spruce, birch, and aspen trees, but as one gets closer and closer…

  • Strange Bedfellows in the Climate Change Saga: The Quest for the Arctic Wolf

    Strange Bedfellows in the Climate Change Saga: The Quest for the Arctic Wolf

    When you travel northbound on Alaska’s famous Dalton Highway heading toward the Arctic Sea, the northern edge of the world, you carry a radio to communicate with the enormous rigs that roar along the road, the giant trucks made famous by the History Channel’s Ice Road Truckers. Radio messages between truckers and non-truckers are simple…

  • 400 ppm World, Part 2: Rising Seas Come with Rising CO2

    400 ppm World, Part 2: Rising Seas Come with Rising CO2

    Every indication is that thermal expansion will not dominate rates of sea-level rise in the future. As Earth’s climate marches toward equilibration with present-day CO2 levels, the climate will continue to warm. And this warming threatens the stability of a potentially much, much larger source for sea-level rise — the world’s remaining ice sheets.

  • 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.