re: We should come to an agreement on what "greenhouse effect" means.
"So Earth has 2.93 x 10^15 kg of CO2"
Or 2.93 trillion tonnes. Or 2.93 Tt
Human CO2 emission per year "26.4 Gt per year" Or .0264 Tt
"Land plants absorb about 440 Gt of carbon per year and the ocean absorbs about 330 Gt. ".
http://www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm
Or in Gt:
About 2930 Gt in the atmosphere
26.4 Gt human emission per year
440 Gt absorbed from Land plants per year
330 Gt absorb from Ocean [ocean plant photosynthesis?] per year
220 Gt used animal respiration per year
220 Gt used by plant respiration per year