The IPCC report of last year and recent NOAA reports have described rapid climate change. Because Earth's climate has experienced periods of warming and cooling some question the possibity of man having any impact (Global Warming). NOAA and IPCC data show the rate of warming is greater than the historical rate of warming. This increase in the rate of warming coincides with mankind's burning of carbon fuels which increases the greenhouse effect, retaining more of the Sun's energy. Does one cause the other or is it just a correlation?