Burning All Fossil Fuels Would Push CO2 to Levels Last Seen Before Forests

Earth’s been around for 4.5 billion years. And during that time, our star has gotten stronger with age. Yet the planet’s climate has stayed relatively stable.

That apparent contradiction recently prompted an investigation by Gavin Foster of the University of Southampton and his colleagues. The scientists suspected that as the sun’s power increased throughout Earth’s history, greenhouse gases must have declined.

To find out, they combed through more than 100 papers in search of an answe

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