Could the building blocks for life on Earth have been delivered by meteorites crashing into ponds of water 4 billion years ago?
A new animated map illustrates the rapid increase in seismic activity in Oklahoma, which scientists attribute to the growth of the fracking industry.
Rising global temperatures are melting areas of permafrost that hold enormous stores of planet warming gases — but the risk of a doomsday methane bomb remains low.
Agricultural runoff and biological waste from the Mississippi River fuel algae blooms each year in the Gulf of Mexico, depleting marine oxygen and sometimes triggering massive die-offs.
President Trump has promised to reverse the coal sector's decline, but coal production plunged by the largest percentage on record in 2016.
President Trump has promised to revive the nation's coal industry, but proposed last month to slash funding to programs that might provide it a lifeline.
The president's $4.1 trillion budget package for 2018 would ax a variety of medical, energy, and basic research programs, while boosting funding for defense and homeland security.
The Arctic is warming twice as fast as the lower latitudes, and scientists report sea ice across the Nares Strait just collapsed two months earlier than normal.
Researchers in California report they have produced a lightweight and flexible semiconductor built on a base of cellulose, the main ingredient in plant fibers.
An Arctic Ocean expedition found plastic "was abundant and widespread" in the waters east of Greenland in the Barents Sea, off the coasts of northern Russia and Scandinavia.