Disavowing climate change

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Quick Introduction
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Climate change is the idea that anthropogenic changes in greenhouse gases, particularly carbon dioxides, methane, and nitrous oxides, are affecting the amount of energy that warms the earth. Fossil fuel emissions and industry have increased the amount of greenhouse gases in the atmosphere and as a result, considerable warmed the earth's average temperature (EPA, 2012).

What are the primary arguments used by individuals and groups that disavow man-made climate change?
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There are several argument against the occurrence of climate change but the most attested ones are that the earth has been warmer in the past, that the most reliable sources of temperature do not show a trend of global warming, climate models are too crude to properly predict global warming, and temperatures have stopped rising (Giddens, 2008).

One of the most prominent arguments against climate change is that the earth has had fluctuations in temperature in the past. At the start of the last millennium, a medieval warm period occurred where there was a steep incline in temperatures in Europe (Giddens, 2008; Nordhaus, 2007). They were even much higher than current day temperatures. Additionally, the Arctic was warmer in the 1930s than it is today. The counter argument is that although there have been warm and extreme cool periods in the past, there has never been such as consistent change in global temperature that what is currently occurring. Also, all of the event in the past were caused by the sun, the earth's orbital variations, or continental changes. Today, none of these are significant contributors to the greenhouse gas ...