I read somewhere that the largest contributer to rising CO2 levels is the oceans, due to deep sea volcanic activity.....which is "warming" the oceans.
Anyone else ???
Besides the oceans LAKES are 'contributing' CO2. There was just a program on the Science Channel about "Exploding Lakes". It was based on accounts in Africa where the locals thought volcanos were below and caused the explosions, but not so.
Scientists were brought in and found the bottom section was 'full' of CO2 gas. After a few decades of constant CO2 build up, the water's weight couldn't hold the gas down and - BOOM, the lakes exploded. Further study found that source of the CO2 was from streams loaded with CO2 gas. The CO2 came from the earths crust and mixed with the stream water as it went below ground, then into the lakes.
So unless there's a population of mole people driving SUV's around willy-nilly, there's not much 'we' can do about this. :-)
Lets' not forget bovine flatulence.