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"First - carbon dioxide is consumed by plants, so it will not "remain in the atmosphere" for long." The duration that CO2 remains in the atmosphere is 100 years on the low end. http://www.newton.dep.anl.gov/askasci/wea00/wea00296.htm "So? None of this means that humans are to blame." So, global temperatures rise over a very short period of time with no identifiable natural cause while concurrently an atmospheric greenhouse gas reaches its highest level in 400,000 years, and your foundation for inaction is a reliance on coincidence. "Out of equilibrium of what?" Equilibrium is a balance of forcings versus reactions, a balancing of the scales. This balance can be found with 5 oz on each side (for instance a very cold condition) or 5 tons (for instance a very warm condition). Historically, shifts in the balance occur over hundreds and thousands of years, not decades. "Now tell me this: how are we causing the temperature rise on Mars?" Hopefully, you realize that Mars is a completely different planet with vastly different atmospheric composition, surface conditions, orbital patterns, and so on. In other words, Mars could be warming at the same time as Earth, cooling at the same time, or going in completely opposite directions, all with equal validity. Even the article you link does not attribute Martian warming to solar variance. ___________________________ Fresh Air. The Scent of Pine. http://scentofpine.wordpress.com