Supporters are not convinced about most alternative explanations of observed warming trends forwarded by sceptics. For example, supporters argue that there are not sufficient data to support the conclusion that the warming is due to sunspot activity, since satellite monitoring of the sun started not until the late 1970s.67 They also point out that the warming cannot be explained by the theory of long-run fluctuations, as going by this theory, the world would currently be in a cooling phase. They recall that in the 1970s, some scientists were concerned about the prospect of global cooling.
66 Marshall 2006.
67 Collier 1997.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.