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Releasing 439 gigatonnes (a gigatonne is one billion metric tons) of carbon dioxide every year into the atmosphere is a problem. CO2 levels in the atmosphere have risen from 313 ppm to just over 400 in just the past 50 years. Deforestation is killing the planets ability to rid itself of CO2. Venus is a perfect example of what happens when to much CO2 is in an atmosphere where it has experienced a runaway climate change and experiences temperatures over 600 degrees Fahrenheit.
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