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Many homeowners could save money on their heating bills by installing heat pumps - but not everyone, and not everywhere.

In the world of cost benefit analysis, if an impact isn't monetized, it doesn't exist. A former EPA official explains what's changing now and why it matters.

Electric vehicles are a fast-growing share of auto sales in many countries, and Chinese automakers are benefiting as the US industry pulls back.

Some of these 'forever chemicals' are toxic at very low levels. They can get into water systems and bioaccumulate in fish, ultimately posing risks to people.

Greenland's inhabitants call it Kalaallit Nunaat, or land of the Kalaallit. It is an Indigenous nation whose relatively few people now mostly govern themselves.

Ski resorts in Colorado can make snow, but it only goes so far.

Excess road and sidewalk salt flows into storm drains and ultimately into area streams and rivers, affecting fish and other aquatic organisms.

One of North America's richest ecosystems, sustained and shaped by Native peoples before European contact, nearly disappeared. A recovery is underway.

Despite Brazil's recent expansions of protected areas, research shows that the favorite habitats of whales and dolphins are still threatened by human activities.

Plants need phosphorus, and other nutrients, to grow. But soil tests can't tell if there's too much.