Understanding the Global Warming Debate

2393 WordsJul 13, 201810 Pages
Throughout history climates have drastically changed. There have been shifts from warm climates to the Ice Ages (Cunningham & Cunningham, 2009, p.204). Evidence suggests there have been at least a dozen abrupt climate changes throughout the history of the earth. There are a few suspected reasons for these past climate changes. One reason may be that asteroids hitting the earth and volcanic eruptions caused some of them. A further assumption is that 22-year solar magnetic cycles and 11-year sunspot cycles played a part in the changes. A further possibility is that a regular shifting in the angle of the moon orbiting earth, with the ensuing changing tides and atmospheric circulation, affects the global climate (Cunningham & Cunningham,…show more content…
Finally, they claim that ExxonMobile’s relationships with government officials have made it possible for them to block federal policies (Easton, 2009, p.155). Next, is data showing that increasing greenhouse gases caused by human activities is causing directly observed climate changes. The first resulting climate change discussed is warming global surface temperature. There has been an increase in global surface temperature of 0.74 degrees C since the late 19th century. In the last 50 years alone the temperature has increased by 0.13 degrees C per decade. North America and Eurasia have seen the largest increase in warmth (Easterling & Karl, 2011, para6). Further, the hottest years recorded since instrument recording of temperatures became possible were from 1995 to 2006. Plus, new measurement analysis of the lower and mid-troposphere show comparable temperature rising rates as surface temperatures (Alley et al., 2007, p.5). Also, in this past century the arctic temperature average has doubled in comparison to the global temperature average (Alley et al., 2007, p.7). In addition, borehole temperatures, snow cover, and glacier recession data all seem to agree with recent warming (Easterling & Karl, 2011, para11). Scientists are saying that the difference between the warming period at the end of the Ice Age and the warming happening now is that the warming at the end of the Ice Age was very gradual over a span of 5,000 years, but the warming now is
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