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Some of those CO2 in a jar experiments will produce warmer temperatures in the CO2 jar...When it does, it is because the jar is sealed...It doesn't show that CO2 causes warming though..it is a demonstration of a phenomenon called the heat of compression...CO2 has a higher specific gravity than air....put it in a sealed jar and heat it up and it will get warmer than air...punch a hole in the top of the jar though and while the CO2 won't escape because it is heavier than air, the temperature will equalize with the jar full of just air...just one more example of warmers fooling themselves...