Global warming: the real cause

Well having study some literature on this topic I have now discovered the real reason for global warming and it was so obvious that it is hard to see.

Quoted from the enlightening site:

You may be interested to know that global warming, earthquakes, hurricanes, and other natural disasters are a direct effect of the shrinking numbers of Pirates since the 1800s. For your interest, I have included a graph of the approximate number of pirates versus the average global temperature over the last 200 years. As you can see, there is a statistically significant inverse relationship between pirates and global temperature.

For more enlightened results please see this journal- JIR (careful it is scientific).