Heartland Institute says talk of Global Warming is akin to mass murder

I stumbled upon some amazingly insane things written about Global warming by US baed Heartland Institute. It has come out with a poster campaign comparing Osama bin laden with people who believe in Global warming. Reproducing below a part of their press release which is in their site.
Sabyasachi

Do You Still Believe in Global Warming?
May 3, 2012 – Billboards in Chicago paid for by The Heartland Institute point out that some of the world’s most notorious criminals say they “still believe in global warming” – and ask viewers if they do, too. The first digital billboard – along the inbound Eisenhower Expressway (I-290) in Maywood – appeared today.

The Heartland Institute is widely recognized as a leading source of science and economics questioning claims that man-made global warming is a crisis. ......
1. Who appears on the billboards?

The billboard series features Ted Kaczynski, the infamous Unabomber; Charles Manson, a mass murderer; and Fidel Castro, a tyrant. Other global warming alarmists who may appear on future billboards include Osama bin Laden and James J. Lee (who took hostages inside the headquarters of the Discovery Channel in 2010).

These rogues and villains were chosen because they made public statements about how man-made global warming is a crisis and how mankind must take immediate and drastic actions to stop it.

2. Why did Heartland choose to feature these people on its billboards?

Because what these murderers and madmen have said differs very little from what spokespersons for the United Nations, journalists for the “mainstream” media, and liberal politicians say about global warming. They are so similar, in fact, that a Web site has a quiz that asks if you can tell the difference between what Ted Kaczynski, the Unabomber, wrote in his “Manifesto” and what Al Gore wrote in his book, Earth in the Balance.

The point is that believing in global warming is not “mainstream,” smart, or sophisticated. In fact, it is just the opposite of those things. Still believing in man-made global warming – after all the scientific discoveries and revelations that point against this theory – is more than a little nutty. In fact, some really crazy people use it to justify immoral and frightening behavior.

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One can see their bizarre original press release at this link: International Conference on Climate Change | Our Billboards

This is quite an unacceptably extreme thing to do, even if they're trying to voice their opinion here. This is certainly not expected of Heartland Institute, which specialises in discussing a topic like Global Warming.
I have found many people (including experts) who believe this is a natural phase in the timeline of our planet. Some of these have been featured on TED Talks. Anthropogenic global warming is a very delicate topic to discuss and has been greatly debated in recent years. I (and most of us here, I am sure) personally agree that whether it is natural or not, man-made factors are without doubt accelerating the process greatly.