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Hawaii lawmakers are considering legislation that would require tourists to pay for a yearlong license or pass to visit state parks and trails. They're still debating how much they would charge.

Climate scientists say Colombia's glaciers could disappear within 15 years. Wet highland areas that provide much of the country's fresh water are getting warmer and drier. And each year, flooding becomes more severe. The coastal area of Tumaco has become an example of how environmental and security pressures are undermining previously stable communities.

Tests in Key West show sediment stirred up by cruise ships, which can harm marine life, routinely exceed federal standards. Key West has responded by suspending the tests.

A new report offers insights for U.K. efforts to improve areas with polluted water supplies.

The Energy Star program has saved Americans more than a half-trillion dollars in energy costs and has reduced climate pollution. Now the Trump administration wants to eliminate or privatize it.

Why the world's poorest people are some of the most effective — and vulnerable — environmental activists.

Two large companies plan to capture natural gas from manure-filled ponds, turning it into clean, climate-saving energy. But some neighbors just want the ponds gone.

The Adirondack Park Agency (APA) has ordered its first adjudicatory hearing in 14 years to review a controversial weapons range proposal in the eastern Adirondacks.

Warsaw's populist government has approved large-scale logging in the ancient Bialowieza Forest, despite an injunction by Europe's highest court. The forest is a World Heritage Site.

The California two-spot octopus can edit the RNA in its brain to produce different proteins as ocean temperatures fluctuate, a new study finds.