Global Warming Threat Essay

891 Words 4 Pages
Climate Change and Global Warming Humanity Greatest Threat
Climate change and global warming are real. The world’s climate is changing, and the changes will have an enormous impact on the planet’s people, ecosystems, cities, and energy use. Average global air temperatures are already 1.5 degrees higher than they were at the start of the 20th century, and have risen about 1 degree over just the last 30 years. Scientists have discover some of the causes for these drastic changes. Greenhouse gases, according to scientists are the main culprit for climate changes. Also, humanity force is another cause for the drastic climate changes we are facing today. Finally, solar variability accounts for most or all of the warming in the late twentieth century
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The amount of warming contributed by natural forces. Furthermore, according to new studies deforestation is a contributor to climate change, global warming, and is often cited as one of the major causes of the enhanced greenhouse effect. Tropical deforestation is responsible for some of the world greenhouse gas emissions. Also, anyone living in or near a large city knows that jets often leave trails behind them, called contrails. Composed of water vapor, they precipitate the creation of low clouds that have a net warming effect. According to a study, contrails in the U.S. may cause a net warming of the surface rivaling that of greenhouse gases and in certain regions, contrails already may contribute as much as the present anthropogenic CO2 forcing on climate. Furthermore, cities tend to be warmer than the suburbs, and the suburbs warmer than rural areas, because they have greater concentrations of energy-producing machines and vehicles and large amounts of concrete, asphalt, and other building and road materials that absorb solar energy and then re-emit thermal energy. These urban heat island effects have been documented by many authors. Finally, studies concluded that the real global mean surface temperature trend is very likely to be considerably to higher temperatures caused by urban heat islands to rising atmospheric CO2

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