Researchers Say The Aliens Are Silent Because They Are Extinct (theconversation.com)

HughPickens.com writes: The Conversation reports that according to research by Dr. Charles Lineweaver and Dr. Aditya Chopra, a plausible solution to Fermi's paradox is near universal early extinction of life on exoplanets, which they have named the Gaian Bottleneck. "The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens," says Chopra. "The mystery of why we haven't yet found signs of aliens may have less to do with the likelihood of the origin of life or intelligence and have more to do with the rarity of the rapid emergence of biological regulation of feedback cycles on planetary surfaces." According to the researchers, 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. However, a billion years or so after formation, Venus turned into a hothouse and Mars froze into an icebox. Even if wet rocky Earth-like planets are in the "Goldilocks Zone" of their host stars, it seems that runaway freezing or heating may be their default fate. Large impactors and huge variation in the amounts of water and greenhouse gases can also induce positive feedback cycles that push planets away from habitable conditions. The difference on Earth may be that as soon as life became widespread on our planet, the earliest metabolisms began to modulate the greenhouse gas composition of the atmosphere. "The emergence of life's ability to regulate initially non-biological feedback mechanisms could be the most significant factor responsible for life's persistence on Earth, conclude Lineweaver and Chopra. "Even if life does emerge on a planet, it rarely evolves quickly enough to regulate greenhouse gases, and thereby keep surface temperatures compatible with liquid water and habitability."

Comments

Re:Conclusion

[BlueStrat]

Global Warming (TM) killed the aliens!

Exactly.

This is just a propaganda piece pushing AGW hysteria.

"OMG! AGW (the alien form of it, anyways) killed all intelligent life in the universe and deniers want us all dead like all life in the universe! They want us all dead!"

I guess what the Church of Anthropomorphic Global Warming cannot reasonably prove with actual science they attempt to propagandize with science fiction straight out of '60s sci-fi TV series plots.

It would be laughable if it weren't simultaneously both dangerous to free and open societies and a sad example of the mass idiocy of a large portion of humanity.

If the global climate changes mankind will do what mankind does best. Adapt and flourish as it has always done. And at the rate of climate change at the global scale, mankind will have more than ample time to do so.

But that doesn't accomplish the real goals of global wealth and political power redistribution, so anyone who dares point out such facts are painted as modern day heretics and calls are made to lock them away in the modern equivalents of church towers like Copernicus and Galileo.

And they dare call people who question any of it "anti-science deniers" when it is they who are actually anti-science, much like the old Roman Catholic Church in Copernicus' and Galileo's day.

Strat