Obama's climate czar is leaving the White House. Heather Zichal's announcement comes just months after she finished crafting the president's new climate plan.
The bees buzzed around like they were drunk. Lab tests show they were poisoned by household pesticides.
Farmers abandoned 1 million acres of farmland after the USSR collapsed, creating what might be the world's biggest human-made carbon sink.
Lake Superior's warming waters make it prime territory for popular sport fish like the walleye -- and for invasive nightmares like the lamprey.
The killers: Cheaper alternatives, dropping demand, and rising costs of generating electricity with dirty coal.
The Big Apple might not be a farming hub, but its residents have higher exposure to pesticides than most Americans. Scientists tell us why.
Duke University researchers discovered radioactive isotopes at alarming concentrations in a creek where fracking wastewater is dumped.
Yosemite National Park's largest glacier could disappear within 20 years, robbing the park's ecosystems of a steady water supply.
A failing fracking company says Canadians owe it $250 million because of a ban on fracking beneath the St. Lawrence River in Quebec.