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1. ecological imbalance will occur
2. pollution will go on increasing
3. percentage of oxygen will goes on decreasing such that oxygen debt will occur
4. there will be increase in temperature
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if more trees r cut more co2 will be accumulated in the atmosphere
it leads to green house effect
due to this green house effect ice in the tundra region melts and below the ice there will be methane gas that methane is released into the atmosphere and it causes much harm
Deforestation will result in environmental degradation and desertification. IT will also  reduce groundwater reserve . The natural habitat of many animals will get completely destroyed . Also ,  there will be increase in temperature of the Earth as a result of global warming , which can disturb the natural water cycle .