July 11, 2017

Following a plateau in the early 2000s, global concentrations of the powerful greenhouse gas methane have hit new highs in recent years. Chemical fingerprint tests seem to rule out a major role for fossil fuels. With more than half a dozen possible natural and human sources, how will  scientists figure out where it's coming from? 

August 14, 2020

As of 2019, the warming effect of long-lived greenhouse gases in Earth's atmosphere had increased by approximately 45% compared to 1990.