contrails

Tom Gardner wrote:


Um, which planet earth do you live on? There have
been multiple "extinction events" which take all of 5
seconds to find on wackypedia.


Over billions of years, yes? How long have we been burning fossil
fuels? 200 years perhaps?

In particular, the "clathrate gun hypothesis" is particularly
relevant.

...
However there is stronger evidence that runaway methane
clathrate breakdown may have caused drastic alteration of
the ocean environment and the atmosphere of earth on a
number of occasions in the past, over timescales of tens
of thousands of years; most notably in connection with the
Permian extinction event, when 96% of all marine species
became extinct 251 million years ago.

And human use of fossils fuels couldn't have caused that. We weren't
using coal to generate electricity or burning gas for our cars 251
million years ago.

Sounds pretty drastic to me!

But it was caused by nature, not interfering humans...