If all the carbon stored in fossil fuels was once in the atmosphere, should the planet then have been too warm to sustain life?

Question

If all the carbon stored in fossil fuels was once in the atmosphere, should the planet then have been too warm to sustain life?

In: Planetary Science

Answer 1

Volcanoes add extra CO2 over long time periods, carbon being stored in fossil fuels is one way the amount of atmospheric CO2 was moderated.

Also life on the whole will survive extra CO2, but many species would go extinct due to their habitat changing and because all of our important staple crops like temperate climates not tropical ones human society would face big difficulties in a hotter planet.