Fossils show plants were producing higher levels of sunscreen chemicals to protect against higher ultraviolet light levels at the end of the Permian period
should be similar throughout this rock sequence, so the increase at the time of the mass extinction must be because plants were producing more of them, he says. “This is the UV signal.”
Higher UV levels would have decreased the growth of plants on land, leading to cascading effects on ecosystems as herbivores and predators starved. The effects on marine environments would have been much smaller because water blocks UV.if countries hadn’t agreed to phase out CFCs under the Montreal protocol in 1987.
“Modelling studies suggest that by the 2060s, had we not had the Montreal protocol, we would have enormous ozone disruption and collapse,” says Jardine. “Hopefully, we have avoided that. These kinds of agreements and environmental protections really do matter.”
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