The blue clouds known as nocticlucent clouds appear earlier than expected over Antarctic.
Scientists have officially confirmed that the well blowout in California was the largest methane leak in U.S. history.
Researchers found that northern lakes are releasing massive and increasing amounts of methane.
It turns out that the amount of methane gas escaping from the Arctic each year is far higher than expected. Scientists have found that during the long, cold period each winter, more methane is entering the atmosphere than thought.