Yeah we'd all love HG wells and his time machine to go back in
time and answer the biggest mystery huh?
I haven't watched or heard keller's counter-hypothesis but here's
my take on the possibilities:
a. Killer Disease
This was probably one of the first theories that surfaced. An
uncurable plague that ravaged the entire population of reptiles and
90% of the mammels, devastated the food chain and life cycle of
most living species. It left only those that could adapt fast (like
cockroaches and rats) survive.
b. Meteor impact
I think it was more likely an ocean impact instead of land since
2/3 of the earth is covered with water. Probability of a hitting
water is higher and there are plenty of ocean beds that scientists
have not explored thoroughly yet.
c. Change in ocean currents or salinity content of the oceans
Taken directly out of 'day after tomorrow' a sudden climatic shift
may have cause widespread changes, brought about super blizzards
and hyper storms that simply changed the face of the earth. After
the earth thawed from the sun's rays, life flourished once
more.
