Originally Posted by jayded6
Also, during past periods of high volcanic activity, and certainly before humans, I'm sure the statistic of humans emitting more C02 than volcanoes would not be correct. That snapshot may only apply to today.
True, because humans haven't been digging up vast amounts of carbon and burning it for very long.
Tomorrow it may not.
I hope not but that is entirely dependent on our ability to develop carbon-free energy sources.
Also, water vapor is a more effective greenhouse gas than co2, and has consistently been around in larger, but variable, quantities.
True but water vapor concentrations are a dependent variable. Something else has to heat the air before water can evaporate.
During glacial periods, less c02 is consumed by plants and absorbed by frozen oceans. But, less water vapor consumed and emitted (available) too. As glaciers retreat, more co2 and water vapor are released, but also consumed. More questions about where we actually are today...
We know we're not in a glacial period so none of that is relevant today.