It has always been assumed that water was a pretty good protector against deadly solar UV and cosmic rays, enough to allow early life to emerge first in the oceans , not on land, until not until the atmosphere offered up ozone protection.
There is no PLAN "B"
Humanity comforted itself that if greedy stupid people among us destroyed the atmosphere, we could still live on, greedy and stupid as ever, under water.
Since that may not now work , we best protect our best friend ,the atmosphere, if we want our grandchildren to be around 80 years from now....
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