The layer model assumes that heat flows between the Earth's surface and the atmosphere byradiation. In reality, the temperature ofthe atmosphere is coupled to the temperature of the ground by convection. Warm air rises and carries heat. As it expands, it cools, leading to a decrease in temperature with altitude. If the atmosphere were incompressible, like water, there would be very little change in temperature with altitude, such as occurs in a pan of water heating up on a stove. If this were the case, then there would be no greenhouse effect because the outgoing IR intensity would be the same regardless of whether the light on average comes from the ground or from high in the atmosphere.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.