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Anyone who disregards the threats of climate change “is stupid,” says retired Lieutenant General John G. Castellaw.

The key to saving elephants and other species may lie in the DNA contained in their droppings, says conservation biologist Samuel Wasser.

Water managers say no, but Native American tribes are keeping careful watch on the “water that connects us.”

The “extinction capital of the world” could start losing unique plant species in as little as a month if funding disappears.

Dozens of these water-filtering species are at risk of vanishing, and that’s bad news for every living creature that relies on them.

The rules, bemoaned by auto manufacturers, would have reduced carbon dioxide emissions by 540 million metric tons.

Eco-books coming out this April look at the life and death of Cecil the lion, the history of oppressive oil development, and living a zero-waste lifestyle.

The Trump administration is backing away from treaty mandate to “give preferential attention to the solution of all border sanitation problems.”

Video: The big cats face a long list of threats, from climate change to habitat loss to the illegal pet trade.

State regulators tried to get the future president to address problems on two golf courses. They got a lesson in how he handles regulatory challenges.