Daylia says "If these claims are true, they toll like a funeral bell for the whole planet." Well, for the reasons stated by many others above, these claims are almost certainly bogus. But the funeral bell does toll. Not for the whole planet (life - in some forms - will survive), but for homo sapiens and many other species. The fossil and geochemical records are full of mass extinctions - some brought on by the wild success of a species or genus or family that use up or poison their habitat or become so densely populated that disease brings crashes the population. So, just because WWII nukes aren't ringing the bell doesn't mean it ain't ringing. My sunny contribution for the day is complete.