Earth's historic climate changes have included ice ages, warming periods and other fluctuations in climate over many centuries.
Some of these historical changes can be attributed to changes in the amount of solar radiation hitting the planet. A drop in solar activity, for example, is believed to have caused the "Little Ice Age," a period of unusually colder climate that lasted from about 1650 to 1850, according to NASA.
However, there is no evidence that any increase in solar radiation could be responsible for the steady increase in global temperatures that scientists are now recording, according to the National Oceanic and Atmospheric Administration (NOAA).
In other words, natural causes cannot be held responsible for global warming. "There is no scientific debate on this point," the NOAA website states.
Indeed, virtually every credible source of scientific research from around the world indicates that human causes — primarily the burning of fossil fuels and the subsequent increase in atmospheric CO2 levels — are responsible for global warming.
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