Is Man-made Global Warming a Hoax?

Marshall Connolly of Catholic OnLIne (COL) describes himself as " a global warming believer."

Dr. Mark Hendrickson is a published writer and Adjunct Professor of Economics  and fellow for economic and social policy with The Center for Vision & Values at Grove City College.

In September 20102, Mark wrote an opinion piece for titled  "Climate Change: 'Hoax' Or Crime Of The Century?"
Is the climate changing? Of course. The climate always has changed and always will.
Is the earth getting warmer? We should hope so for at least two reasons: First, the world emerged from the Little Ice Age in the 19th century, so it would be worrisome if it weren’t getting warmer.  Second, all the history indicates that humans thrive more during warmer periods than colder ones. 
Are we humans causing the warming by our carbon emissions? Actually, most of the “greenhouse effect” is due to water vapor, which makes one wonder why the EPA hasn’t designated H2O a harmful pollutant that they must regulate.
In order to gain some balance for Catholic OnLine, Marshall Connolly decided to interview Mark Hendrickson. (link)
COL:  Now Mark, what qualifies you to speak as an expert on Global Warming?

HENDRICKSON: I hesitate to describe myself as an expert, inasmuch as that word might best be reserved for climate scientists. I am, however, comfortable with describing myself as knowledgeable about the subject. I have followed it for over 20 years.
Hendrickson describes the similarities between the study of climate change and the study of economics.
COL:  Global warming, real or a hoax?

HENDRICKSON: If, by global warming, you mean do I think the climate has warmed over the last 100-150 years, the answer is yes. The world emerged from a little ice age in the 19th century. We should be getting warmer now.
Is the theory of man-made global warming a hoax? I think so. Let's say either a hoax or an error. It's a hoax when perpetrated by those who let a political agenda shape science rather than the other way around. 
Hendrickson then claims that the Alarmists (my word) have "abandoned their own theory."
For years they tried to convince us that the more CO2 humans injected into the atmosphere, the hotter the world would get. Now, after 15 or so years of no warming, they admit that the world could cool for 40-50 years even as total CO2 emissions continue to increase.
Satellite data showed no statistically significant warming in the last two or three decades. Other scientific data show that the Antarctic ice cap is adding 27,000,000,000 tons of ice per year. I believe that the last two or three winters have seen much more ice in the Arctic that in the years immediately prior to that, but it is an essentially irrelevant point. Arctic ice should be of no concern because the Arctic is an open ocean, and according to Archimedes' principle, the water level will be the same whether it is frozen or in liquid form.

During the medieval warm period, which was warmer than today, coastal areas and supposedly climate sensitive races like Greenland were not being inundated. 
After discussing Al Gore's science fiction movie, COL moved to consensus.
COL: My understanding is that there is a strong consensus among climatologists that global warming is real and that it's a threat. You say this isn't so. Tell me about your figures.

HENDRICKSON: Consensus is a political concept, not a scientific concept. Consensus is not truth. The Oregon Institute of Science and Medicine obtained over 30,000 signatures by scientists with advanced degrees urging our government to take no radical actions to combat alleged global warming.

Read the Full article at Catholic OnlLine (Link)

H/t Cole Pritchard