Feedback Form for WebCT Students: Click icon to the left for a form on which you can record your understanding of this material. (Password protected.) For further reading, we suggest "The Declining Middle," an essay in the Atlantic Monthly by Bob Kuttner. Kuttner's 1983 essay analyzes the effects of various economic changes in American life. (It is interesting to see, now, how much of what he said about these effects has come to be true.) For a lengthy and complex article that defines the causes of homosexuality, read Chandler Burr's "Homosexuality and Biology." Burr's article ( Atlantic , 1997) is also an excellent example of an essay that defines .
One of the most common natural disasters, but also one of the most commonly forgotten, is wildfires. These take place in many different countries all over the world, particularly during the summer months, and can be caused by a range of different things. Some of the things that can start the wildfires can be totally natural, while others can be manmade, but the speed at which they spread is entirely down to nature. The two natural causes of wildfires are the sun’s heat and lightning strikes, while they can also be caused by campfires, smoking, fireworks and many other things. The reasons that they spread so quickly are prolonged hot, dry weather, where the vegetation dries out, which is why they often take place in woodland.
Human activity is not solely responsible for climate change. It can occur due to natural causes as well. Large volumes of sulphur dioxide, ash, water vapor and dust escape into the atmosphere when a volcano erupts. Volcanoes also produce aerosols which reflect solar energy back into space. This cools the atmosphere. However, although volcanoes produce CO2 and greenhouse gases it is minor when compared to what we humans emit into the atmosphere. Changes in the Earth’s orbit and changes to the ocean’s currents are also natural causes that cause climate change.