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==== Fossil fuels ====
[[Image:Carbon Dioxide 400kyr.png|thumb|250px|right|Carbon dioxide variations over the last 400,000 years, showing a rise since the industrial revolution.]]
Beginning with the [[industrial revolution]] in the [[1850s]] and accelerating ever since, the human consumption of fossil fuels has elevated CO<sub>2</sub> levels from a concentration of ~280 ppm to more than 370 ppm today. These increases are projected to reach more than 560 ppm before the end of the 21st century. It is known that carbon dioxide levels are substantially higher now than at any time in the last 800,000 years [Carbon dioxide levels are substantially higher now than at any time in the last 800,000 years]
Along with rising [[methane]] levels, these changes are anticipated to cause an increase of 1.4–5.6 °[[Celsius|C]] between 1990 and 2100 (see [[global warming]]). ==== Aerosols ====
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