Among the most iconic image of Al Gore’s “An Inconvenient Truth” was that of coastlines and cities disappearing beneath rising seas.

Sea level rise is certainly one of the more worrisome impacts of climate change, but the film’s disregard of the time scales involved in sea level rise may have led some to think that sea level rise on the order of 20 feet is probable in this century. Scientists cannot completely rule out such rapid sea level rise, but the general sense in the climate science community is that a lower but still worrying degree of sea level rise is more likely.

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Broadcast meteorologists do not have the best of reputations for predictive accuracy. Audiences are particularly good at remembering - and at pointing the finger - when they’re wrong. Few heap praise when their forecasts turn out to have been accurate.

So the rainy day expected tomorrow sometimes turns out to be sunny, and projections more than a week away are usually offered - and taken - with the proverbial grain of salt.

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Water vapor is one of the most important elements of the climate system. A greenhouse gas, like carbon dioxide, it represents around 80 percent of total greenhouse gas mass in the atmosphere and 90 percent of greenhouse gas volume.

Water vapor and clouds account for 66 to 85 percent of the greenhouse effect, compared to a range of 9 to 26 percent for CO2. So why all the attention on carbon dioxide and its ilk? Is water vapor the real culprit causing global warming?

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“Global temperatures have not increased since 1998.”

That point has been a common argument among climate skeptic communities in the blogosphere for the past few years. It gained prominence recently in an article in the New Statesman by David Whitehouse, a journalist and former BBC science correspondent.

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Few climate change topics arouse more passion than the seemingly dry field of climate modeling.

Critics thunder that the models contain a “large element of subjectivity” with parameters “tweaked by those who operate the models” to achieve results that conform to scientists’ preconceptions. Some seem to think that these models simply represent a grandiose exercise in curve fitting, forecasting future climate based on the trend in temperatures over the past few decades.

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Journalists covering the climate change issue for any period of time quickly run across arguments that the big concern just a few decades back had involved global cooling and not global warming.

They will do well to step back and look hard at those claims to see if they really hold up.

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A fundamental misconception about the role that carbon dioxide plays in glacial transitions has helped fuel the argument that the lag time between temperature and CO2 in the paleoclimate record casts doubt on carbon dioxide as an important greenhouse gas.

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Some in the news media may be overplaying the extent of the risk that Northern Europe might soon plunge into a new Ice Age. They risk going beyond where the best science can now take them.

“Britain could be heading for a climate like Alaska,” the BBC reported back in 2003. It painted a stark picture of a life in which “our ports could be frozen over. Ice storms could ravage the country, and London could see snow lying for weeks on end.”

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