It said on its website that: "Unusual hurricane activity is not related to greenhouse warming".
Further, greenhouse warming takes place more in the winter, which lengthens growing seasons.
The possibility of more climatic variability, though, does not, in itself, mean that greenhouse warming is not happening too.
But, for those of a nervous disposition, the tying of an ancient greenhouse warming to an ancient mass extinction might suggest lessons for the future.
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Modelling suggests that a world where additional greenhouse warming has been cancelled out this way will still be warmer at the poles and cooler at the tropics.
They also conclude that greenhouse warming has partially been offset by the cooling effect of aerosols - tiny particles of dust thrown into the atmosphere that can reflect solar radiation back into space.
And Giles Harrison believes climate sceptics need to apply the same scepticism to the cosmic ray theory as they do to greenhouse warming - particularly those who say there are too many holes in our understanding of how clouds behave in the man-made greenhouse.
One theory is that an initial warming changed the distribution of heat in the oceans so that deposits of gas hydrates on the sea floor were released, with carbon dioxide and methane rising to the surface and entering the atmosphere, causing further greenhouse warming.
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Overall, I believe it is fair to say that the Stern Review consistently leans toward (and consistently phrases issues in terms of) assumptions and formulations that emphasize optimistically low expected costs of mitigation and pessimistically high expected damages from greenhouse warming relative to most other studies of the economics of climate change.
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So from their point of view, asking rich nations to peak their emissions within a few years and halve them within five isn't unreasonable - especially, as another portion of the text says, that the problem of greenhouse warming has been on the radar for so long that rich countries could have peaked their emissions during the 1990s if they had wanted to.
In later years, when he and his colleagues had pushed climate change, and in particular greenhouse warming, on to the agenda, people keen to ensure a lack of action made much of his about-face over cooling, preferring to accuse him of modish inconsistency than to see him as someone who had worked to improve his models, and as a result had changed his mind.
The approximate stand-still of global temperature during 1940-1975 is generally attributed to an approximate balance of aerosol cooling and greenhouse gas warming during a period of rapid growth of fossil fuel use with little control on particulate air pollution, but quantitative interpretation has been impossible because of the absence of adequate aerosol measurements.
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This type of shift has occurred repeatedly in the last century, both before and during (modest) global warming from greenhouse gases.
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Slowing the buildup of greenhouse gases responsible for warming the planet is one of the biggest challenges the United States and President Barack Obama face.
In this audio section, BBC World Service environment specialist Richard Black explains the so-called greenhouse effect, global warming, the implications for the human race and the significance of the Kyoto summit.
But the law's supporters argue that other places will inevitably regulate greenhouse gases as global warming begins to bite and that Californian businesses will benefit from being in the vanguard of this trend.
The academics advocate concentrating first on short-term fixes for greenhouse gases or other warming agents, such as black carbon - particles emitted from the incomplete burning of fossil fuels, principally in diesel engines and wood stoves.
California, of course, has led the way toward cleaner vehicles, often adopting stricter laws than the federal government to control greenhouse gases and combat global warming.
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That has prompted some to speculate that the Earth may be entering another cool period that could offset the warming caused by greenhouse gases trapping heat in the planet's atmosphere.
On energy, 53% of survey participants said they approved of a proposal that would require companies to reduce greenhouse gases that cause global warming, even if it would also mean higher utility bills for consumers.
At a climate change conference in Brussels on Tuesday, the Deputy Prime Minister, John Prescott, told European Union ministers there was a "causal link" between greenhouse gas emissions, global warming and the serious flooding affecting much of Britain.
Others note that Mr Bush's speech also repeated his support for un-green measures such as his Clear Skies Initiative, a bill to regulate emissions from power plants that excludes carbon dioxide (the principal greenhouse gas responsible for global warming), and his energy bill, which strongly boosts coal and nuclear power and proposes opening up protected areas of Alaska to oil-drilling.
He pledged his government's commitment to developing clean energy sources and reducing greenhouse gas emissions that cause global warming.
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The warming effect caused by greenhouse gases rose 29% since 1990 and 1.4% over the last 12 months ending Dec. 31, 2010.
Destruction of the world's forests releases large quantities of CO2, which form part of the greenhouse gas emissions that cause global warming.
Well, that's the only idea that we're trying to talk about when it comes to these greenhouse gases that are causing global warming.
But data from global weather satellites and more comprehensive weather balloons show no hotspot, and no fingerprint, which means no serious global warming due to human greenhouse gas emissions.
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These match climate models' predictions of what happens when warming is induced by greenhouse gases better than it matches predictions of the result of changes in the sun's activity, the main alternative hypothesis for what might be causing the climate to change.
The UN models agree with established science that if human greenhouse gas emissions were causing global warming, there should be a hot spot of higher temperatures in the troposphere above the tropics, where collected concentrations would have the greatest effect, and the warming would show up first.
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