| http://www.w3.org/ns/prov#value | - d 8.8 gigatonnes over what scientists see as tolerable.Greenhouse gas levels are rising, particularly for carbon dioxide, because more is remaining in the atmosphere than natural processes can deal with.Carbon dioxide is naturally taken up and released by plants and the oceans but mankind's burning of fossil fuels such as coal for power and destruction of forests means the planet's annual carbon
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