Brazil’s presidential election is down to two polarizing candidates, and experts say the runoff will be a major test for one of the world’s largest democracies.

Governments endorsed the Glasgow Climate Pact and made new pledges on deforestation, methane emissions, coal, and more. But critics say they failed to secure more ambitious commitments to limit globa…

A changing climate and growing competition for resources is raising tensions among Arctic nations.

With this major U.S.-Russia nuclear arms control agreement set to expire next year, Washington should coordinate with Moscow for a New START treaty extension to allow for further negotiations and the…

Experts have warned that time is running out to avoid climate catastrophe. Will the global climate conference spark action?