DID CLIMATE CHANGE SAVE EARTH FROM ALIENS?
The aliens are silent because they are extinct
21 January 2016 (Australian National University)
“…In research aiming to understand how life might develop, [astrobiologists from ANU Research School of Earth Sciences] realised new life would commonly die out due to runaway heating or cooling on their fledgling planets…[Because the universe is probably filled with habitable planets, it] should be teeming with aliens…[but early life is fragile and] rarely evolves quickly enough to survive….Most early planetary environments are unstable. To produce a habitable planet, life forms need to regulate greenhouse gases such as water and carbon dioxide to keep surface temperatures stable…About four billion years ago Earth, Venus and Mars may have all been habitable…[but] Venus turned into a hothouse and Mars froze into an icebox…[Early microbial life there probably] failed to stabilize…A plausible solution to [what scientists call] Fermi's paradox…is near universal early extinction, which they have named the Gaian Bottleneck…” click here for more