When a 9.0 earthquake devastates a region, or generates a tsunami, you can't blame global warming.  If a   Chicxulub -size asteroid plunges into Planet Earth, the one that killed off the dinosaurs, that has nothing to do with carbon dioxide or methane in the atmosphere.  Which leads me to share some info I found about life-extinction visitors from outer space: Probably the largest know asteroid was the one that struck  Vredefort  in South Africa 2 billion years ago.  The diameter was between 6 and 9 miles.  The resultant crater was 190 miles across.  Of course life on Earth was severely compromised.  Of course, it was all microbiological, for first fungus did not come until around a billion  years ago.  We live on a dangerous planet, for  99% of all life species have expired . The 6-mile diameter asteroid that caused the 110-mile  Chicxulub Crater  of Mexico killed off the dinosaurs around 66 million years ago.  ...