in humans. Some organisms have effective defense mechanisms, and many can repair some of the damage UV radiation causes."
Previously, it was thought that atmospheric oxygen levels of around 1 percent of today's levels would produce enough ozone to keep harmful UV radiation away. Now, using advanced computer climate simulations, the team suggests that the key oxygen level might be more like 5-10 percent. In other words, for long stretches of time across the past 2.4 billion years when we thought there was enough ozone around to significantly block UV rays, that might not have been the case. As the researchers explain, that has a knock-on effect on life on Earth and even which organisms can flourish.
When I was doing graduate work a professor was on the international body which named geologic time periods. The first ~4 billion years of earth’s history is called the Precambrian. There was a movement to name the earliest of the Precambrian as the Hadean (ie Hades) Eon.
“We” is probably scientists…?
Presumably the “we” is an exclusive group of western elites
We’ve been lucky last 4000 years..living in the Perfect lull for Humans…
Most people with half a brain knew lol
Pfft. Most modern people underestimate how difficult conditions 150 years ago were.
Define 'We.'
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