Energy-efficient windows can improve comfort and reduce heat loss. Learn how they work, what features matter and when ...

Over the last several weeks, tensions over the future of Greenland have raised the risk of a military confrontation between ...

The United States is the only country to pull out of the global agreement among nations to fight climate change. European ...

ANALYSIS: Trump’s dispatching of Tom Homan to Minneapolis lets him keep his base happy while avoiding more of the violence ...

The High Seas Treaty took effect Jan. 17, creating the first global framework to protect and manage the vast waters beyond national borders that cover more than 40 percent of the planet. Humanity ...

As Trump considers buying Greenland, the island grapples with hazardous US military waste and environmental liabilities.

The storm is among the most extreme and widespread in years and is set to shut down travel and knock out power across a huge area.