I think that Hurricane Sandy it was caused by global warming.

First we have to understand what is global warming and what causes global warming.One of the first things scientists learned is that there are several greenhouse gases responsible for warming, and humans emit them in a variety of ways. Most come from the combustion of fossil fuels in cars, factories and electricity production. The gas responsible for the most warming is carbon dioxide, also called CO2. Other contributors include methane released from landfills and agriculture (especially from the digestive systems of grazing animals), nitrous oxide from fertilizers, gases used for refrigeration and industrial processes, and the loss of forests that would otherwise store CO2. In order to understand the effects of all the gases together, scientists tend to talk about all greenhouse gases in terms of the equivalent amount of CO2. Since 1990, yearly emissions have gone up by about 6 billion metric tons of “carbon dioxide equivalent” worldwide, more than a 20 percent increase.

Millions were paralyzed by Hurricane Sandy as the storm swept up the East Coast Monday night into Tuesday. The storm made landfall in New Jersey but shut down federal government offices, public transportation systems, and schools in Washington, D.C. and New York City.

As the disastrous effects of the storm become clear Tuesday, speculation begins as to whether or not the extreme weather event was caused by global warming. The topic remains controversial in the American political landscape, while research shows that climate change does have an effect on the severity and increased frequency in such storms. A recent report from University of Copenhagen’s Centre for Ice and Climate said hurricanes in the southeast Atlantic have become more frequent over the past 90 years, with more storms in years where water temperature is higher.

“You can’t say [global warming] caused any single event, but when we start to see a trend like this, I think it shows that there’s a good chance these hurricanes wouldn’t be happening without warming,” said one of the report’s authors, Aslack Grinsted. “What I show is only correlation, but it’s purely consistent with the hypothesis that warming goes along with more frequent, large hurricanes.”

http://www.usnews.com/opinion/articles/2012/10/30/was-hurricane-sandy-caused-by-global-warming

http://environment.nationalgeographic.com/environment/global-warming/

http://en.wikipedia.org/wiki/Global_warming