Fairen, A. G. 2017. Icy Mars lakes warmed by methane. Nature Geoscience 10, 10, 717-718, DOI: 10.1038/ngeo3037
The release of methane trapped in Martian subsurface reservoirs following planetary obliquity shifts may have contributed to episodic climate warming between 3.6 and 3 billion years ago, explaining evidence for ancient ice-covered lakes.
