1、Global warming is a natural phenomenon. Because people burning fossil fuel, such as oil, coal, or deforestation and the burning will produce large amounts of carbon dioxide, the greenhouse gas, these greenhouse gases on the radiation from the sun visible light has high permeability, and the long wave radiation emitted from the earth with a highly absorbent, can strongly absorb infrared radiation on the ground, resulting in the earth's temperature to rise, the greenhouse effect. And when the greenhouse effect will continue to accumulate, resulting in gas absorption and emission of energy balance, energy accumulation in the earth atmosphere system, resulting in rising temperature, resulting in the phenomenon of global warming. Global warming will make the global distribution of precipitation, glaciers and permafrost melting, sea level rise, not only endanger the balance of natural ecosystems, but also threaten the survival of mankind.

　　2、全球气候变暖是一种自然现象。由于人们焚烧石燃料，如石油，煤炭等，或砍伐森林并将其焚烧时会产生大量的二氧化碳，即温室气体，这些温室气体对来自太阳辐射的可见光具有高度透过性，而对地球发射出来的长波辐射具有高度吸收性，能强烈吸收地面辐射中的红外线，导致地球温度上升，即温室效应。而当温室效应不断积累，导致地气系统吸收与发射的能量不平衡，能量不断在地气系统累积，从而导致温度上升，造成全球气候变暖这一现象。全球变暖会使全球降水量重新分配、冰川和冻土消融、海平面上升等，不仅危害自然生态系统的平衡，还威胁人类的生存。

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