The theory of global warming is based on a theory called "the greenhouse effect". The "greenhouse" theory says that certain gases get trapped in the troposphere eight to eleven miles high. Further the theory says that these gases help to prevent the escape of heat from the planet.
Now, carbon dioxide is, as a matter of fact, one and a half times heavier than oxygen and travels along the ground. It therefore cannot be found in the troposphere and is therefore not a greenhouse gas.
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