Scientists have been doing some great work when it comes to peering back through billions of years to figure out what ancient Earth would have looked like, and a new study reveals that the earliest conditions on our planet were probably even more hos
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.
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