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-This is natural causes, including causes 4
+ First: because of volcanic activity on Earth, with a large amount of heat and high temperatures, which are produced from the land, accompanied it is due to the volcanic dust cloud caused up, makes the air too much oxygen burned
+ Monday: due to the movement of the earth's orbit alters atmospheric surface facilitate Co2 generated and exit surface is atmospheric, but this is only a small cause to cause global warming
+ Next is due to the change of ocean currents on the ocean hot, ocean currents have a strong influence on earth's temperature and the temperature heats up.
+ Finally, the greenhouse effect, this is the most important reason, because of the greenhouse effect makes things change, as climate change, and the effects human absorbing Co2 and temperature from the sun, the sun's influence, causing the planet to heat up more and more.
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