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The Sun and Earth in the distant future What happened in the past

The Sun and Earth in the distant future What happened in the past? Early atmosphere was rich in CO2 – kept Earth warm by strong greenhouse effect Clouds may also matter – some evidence that CR encourage cloud cover at low altitudes, leading to higher reflection and lower temperature; strong early solar wind may have excluded galactic CR, leading to lower cloud cover and higher temperature CO2 gradually locked up in carbonates and plants (limestone deposits contain about 70 atmospheres of it!) – so greenhouse effect decreased as solar irradiation increased (the Gaia effect) Current climate models suggest that including biospheric (Gaia-type) effects may actually increase CO2 production as vegetation dies back – so feedback probably won’t help in future.

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