Proceedings of the National Academy of Sciences
The U.S. withdrawal from the Paris Agreement is prompting more than 1,400 mayors to make their own pledges.
A new study on human cooperation could shed light on why some take radical steps.
The South American polka dot tree frog gives off an "intense greenish-blue glow" under UV light, scientists say.
Dimock, Penn. Lawsuit Trial-Bound as Study Links Fracking to Water Contamination in Neighboring County
A recent peer-reviewed study published in the Proceedings of the National Academy of Sciences has confirmed what many fracking critics have argued for years: hydraulic fracturing for oil and gas can contaminate groundwater.