The document discusses global warming, the greenhouse effect, and climate change. It defines these terms and explains how they are interrelated. Global warming refers to the gradual increase in Earth's temperature caused by human activity that increases greenhouse gases. This leads to changes in climate over both short and long periods. The greenhouse effect describes how the atmosphere absorbs and radiates heat from the sun, which can impact temperatures. The document then discusses the primary human causes of global warming, potential economic and environmental consequences, and some actions individuals can take to reduce their contribution to the problem. It also presents opposing arguments that question the extent or causes of global warming.