State of the Planet

News from the Columbia Climate School

climate treaties

  • Climate Change and the Complexity of Science

    Climate Change and the Complexity of Science

    The diplomatic debate about phasing out HFCs has been underway for seven years, but the technology of refrigerant coolants appears to have finally caught up with the need for replacement technology. Once replacement technology is available, diplomacy becomes possible.

  • Playing for the Planet

    Playing for the Planet

    Scott Barrett, the Lenfest-Earth Institute Professor of Natural Resource Economics and an expert in complex international negotiations, teaches game theory in his Global Collective Action class. Using a simple card game, Barrett helps his students understand the consequences of decision making in complex negotiations, like those involved in climate treaties, where each country’s actions depend…

Photo of the Earth from space with the text "Lamont at AGU25" on top.

AGU25, the premier Earth and space science conference, takes place December 15-19, 2025 in New Orleans, Louisiana. This year’s theme—Where Science Connects Us—puts in focus how science depends on connection, from the lab to the field to the ballot box. Once again, Lamont-Doherty Earth Observatory and Columbia Climate School scientists, experts, students, and educators are playing an active role, sharing our research and helping shape the future of our planet. #AGU25 Learn More

  • Climate Change and the Complexity of Science

    Climate Change and the Complexity of Science

    The diplomatic debate about phasing out HFCs has been underway for seven years, but the technology of refrigerant coolants appears to have finally caught up with the need for replacement technology. Once replacement technology is available, diplomacy becomes possible.

  • Playing for the Planet

    Playing for the Planet

    Scott Barrett, the Lenfest-Earth Institute Professor of Natural Resource Economics and an expert in complex international negotiations, teaches game theory in his Global Collective Action class. Using a simple card game, Barrett helps his students understand the consequences of decision making in complex negotiations, like those involved in climate treaties, where each country’s actions depend…