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Carbon dioxide (CO2) is the gas that is most commonly associated with man's contributions to the issue. We cause this by burning fossil fuels (coal, oil and natural gas). This burning releases long stored carbon that has been underground for millions of years. We produce about 3% of this gas which has been enough to keep the planet comfortably warm for millions of years. Now, by adding the extra CO2, we are causing global warming. Some of that 3% is through processes that would naturally occur even if humans were not involved with the process.

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Q: What is a man-made contribution to greenhouse gases in the atmosphere?
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