Natural ecology of the most serious killer, with about deforestation. . Massive deforestation due to human, has made the process of arable land, destroyed the delicate balance of the original form of nature, especially the oxygen cycle, so that more oxygen circulation rate slowed. According to the survey, felled trees each year, about 5 to 1 billion, plus the number of forest fires so that global deforestation is alarming, afforestation rate lagged far behind.
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