“While the increase in carbon dioxide in the atmosphere is the main effect of globalwarming, there are other effects as well. For example, there is a markedincrease in infectious diseases that have changed their range in the past fewyears. Cases of malaria and dengue fever have occurred as far north as NewYork, New Jersey and Michigan in recent years, and diseases such as encephalitisand becoming more common. The sea level has changed, affecting low-lying areasand destroying beaches and wetlands around the world. Glaciers and snow coverare gradually disappearing on all five continents. And finally, plant andanimal populations are shifting and migration patterns are changing as speciestry to adapt to changing climates. Some species that are unable to adaptsuccessfully have begun to decline. More severe weather events, such asdroughts and flooding, are also a consequence of global warming, and a warningthat action must be taken to preserve the environment now.” (From “The Sierra Club Global Warming Campaign” in J. Buckley, ed., The Harbrace Reader forCanadians, p. 273) From what perspective does the passage discuss global warming?