| http://www.w3.org/ns/prov#value | - The total amount is actually very small: Today C02 represents about 330 parts per million (ppm) of our atmosphere, but by 2030 or 2040 it is likely to reach a concentration of 500 to 600 ppm.Where is this additional carbon dioxide coming from?There are many sources, but the one he is probably caused most of the increase over the last 100 years is the burning of fossil fuels such as coal, oil, and
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