Political polarization is a trap that is easy to fall into, but many Americans are looking for a sense of unity and leadership that represents our common values and shared sense of community.

New research from Columbia climate scientists shows that the 1987 ozone treaty, designed to protect the ozone layer, has postponed the occurrence of the first ice-free Arctic by as much as 15 years.

Columbia engineers have developed a machine-learning algorithm that will aid in understanding and mitigating the impact of extreme weather events, which are becoming more frequent in our warming climate.

On July 1, Jeffrey Shaman will become interim dean of the Climate School, continuing the work of co-deans Alex Halliday, Jason Bordoff, Ruth DeFries, and Maureen Raymo, climate leaders who built the School’s strong foundation.

Inspired by Bash the Trash, kids had a chance to make musical instruments out of reusable materials, then perform in a parade.