Essay on Is Human Activity Responsible For Global Warming?

1183 Words Nov 22nd, 2016 5 Pages
Is Human Activity Responsible for Global Warming?
Over the last century, the global temperature of the Earth had changed drastically. Before the industrial revolution, the Earth’s climate changed due to natural factors rather than human activities; variation in sunlight and volcanic eruption were the natural causes of climate changes in the past. While these natural causes are still in play today, however, their influences are too small compare to human activities ("Is Current Warming Natural?"). Majority of scientists agree that the current global warming is due to human expansion of the “greenhouse gas effect”, that is, when the greenhouse gases absorb IR radiation and prevent it from radiating toward outer space which results in gradual heating of the Earth’s atmosphere and surface. Greenhouse gases that contribute to the global warming include water vapor, carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons. Human activities are changing the natural greenhouse in the atmosphere. Over the last 150 years, industrial activities raised atmospheric carbon dioxide levels from 280 parts per million to 400 parts per million. Therefore it is our responsibility to reduce carbon dioxide emissions in order to lessen the severity of global warming ("Is Current Warming Natural?").
The primary sources of greenhouse gas emissions in the United States are electricity production, transportation, industry, commercial and residential, agriculture,and land use and forestry.…

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