Andrew Bolt gets a perfect score on global warming

This one is misleading. Bolt does not mention that Revelle died in 1991. Needless to say, the scientific basis has strengthened since then.

3: Gore says ice cores from Antarctica, that go back 650,000 years, show the world got warmer each time there was more carbon dioxide in the air.

In fact, as the University of California's Professor Jeff Severinghaus and others note, at least three studies of ice cores show the earth first warmed and only then came more carbon dioxide, many hundreds of years later. So does extra carbon dioxide cause a warming world, or vice versa?

This one is very misleading. Let's look at what Severinghaus says about this:

Does this prove that CO2 doesn't cause global warming? The answer is no.

The reason has to do with the fact that the warmings take about 5,000 years to be complete. The lag is only 800 years. All that the lag shows is that CO2 did not cause the first 800 years of warming, out of the 5 000 year trend. The other 4,200 years of warming could in fact have been caused by CO2, as far as we can tell from this ice core data.

In other words, CO2 does not initiate the warmings, but acts as an amplifier once they are underway. From model estimates, CO2 (along with other greenhouse gases CH4 and N2O) causes about half of the full glacial-to-interglacial warming.

Note that Severinghaus was the authority Bolt cited.

4: Gore shows a series of slides of vanishing lakes (like Lake Chad) and snow fields (like Mt Kilimanjaro's) and blames global warming for it all.

Mt Kilimanjaro was losing its snows more than a century ago, not because of global warming, but - says a 2004 study in Nature - largely because deforestation has cut the moisture in the air.

This one is wrong. Eric Steig explains:

The Heartland Institute's propagation of the notion that the Kilimanjaro glacier retreat has been proved to be due to deforestation is even more egregious. They quote "an article published in Nature" by Betsy Mason ("African ice under wraps," Nature, November 24, 2003) which contains the statement, "Although it's tempting to blame the ice loss on global warming, researchers think that deforestation of the mountain's foothills is the more likely culprit".