We’ve all noticed the increase in extreme weather over the last few months. Almost two-thirds of the lower 48 states are now suffering from drought conditions, the Washington Post pointed out last week. Nearly all of Iowa, Nebraska, Kansas, Missouri, and Illinois are in extreme or exceptional drought, making this the worst dry spell since the 1950s.

It’s not only been dry; the New York Times reported that the first six months of 2012 were the hottest since record keeping began in 1895. In early July, another Times article noted, the surface of Greenland’s ice sheet melted to a greater extent than ever observed in 30 years of satellite monitoring. About half of the surface of the ice sheet usually melts, but from July 8 to July 12, the ice melt reached 97 percent.

More and more people are making the connections between the extreme weather and climate change. The percentage of Americans who now believe that climate change is occurring rose to 70 percent in July, according to a University of Texas poll, and those insisting that it was not fell to 15 percent. A 2010 survey showed, in contrast, that only 52 percent of the American public thought that the climate was changing.

The following video from July 2012 shows Earth’s land surface temperature data from 1800 to 2009, tracking deviation from the mean temperature and overall global warming since the Industrial Revolution. For more information about this study visit http://berkeleyearth.org.

The story told in this video, even though it’s statistical, couldn’t be more dramatic. All one has to do is watch the spread of yellow, orange, and red across the map to understand that the planet is not the same place it was in 1800. The real question is, what are we going to do about it? In Bill McKibben’s words, “Climate change operates on a geological scale and time frame, but it’s not an impersonal force of nature; the more carefully you do the math, the more thoroughly you realize that this is, at bottom, a moral issue.”