I spent the last few months having my mind blown by the existence of super volcanoes. Now I am learning about megafloods. They seem to pose an actual threat for the 21st century. What do you guys/gals think?!
Here are the main points if you don't want to read the article:
http://www.nature.com/scientificamerican/journal/v308/n1/ful...
And here is a wiki page re: atmospheric rivers