Most climate scientists agree that the main cuase of the current global warming trend is human expanion of the “greenhouse effect” warming that results when the atmosphere traps heat radiating from Earth towards space. Certain gases in the atmosphere block heat from escaping. Long-lived gases, remaining semi-permanently in the atmosphere, which do not respong physically or chemically to changes in temperature are described as “forcing” climate change whereas gases, such as water, which respong physically or chemically to changes in temeprature are seen as “feedbacks.”
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