Satellite data suggest that coal mines in the US southwest are [ leaking lots of methane ]( http://www.theguardian.com/environment/2014/oct/10/satellite-data-shows-surprising-methane-hotspot-in-us-southwest ) .
Ссылка: https://stallman.org/archives/2014-jul-oct.html#13_October_2014_%28US_coal_mine_methane_leaks%29