• One more nail in the coffin of climate skeptics

    heatwave_2006

    A new paper in the Proceedings of the National Academy of Science, by James Hansen, Makiko Satoa, and Reto Ruedyb, argues that the increased occurence of episodes of very high temperatures, such as the 2003 heat wave in Europe, provides statistical confidence that there is an underlying process of global warming.

    Perception of climate change
    “Climate dice,” describing the chance of unusually warm or cool seasons, have become more and more “loaded” in the past 30 y, coincident with rapid global warming. The distribution of seasonal mean temperature anomalies has shifted toward higher temperatures and the range of anomalies has increased. An important change is the emergence of a category of summertime extremely hot outliers, more than three standard deviations (3σ) warmer than the climatology of the 1951–1980 base period. This hot extreme, which covered much less than 1% of Earth’s surface during the base period, now typically covers about 10% of the land area. It follows that we can state, with a high degree of confidence, that extreme anomalies such as those in Texas and Oklahoma in 2011 and Moscow in 2010 were a consequence of global warming because their likelihood in the absence of global warming was exceedingly small. We discuss practical implications of this substantial, growing, climate change.

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    • Klem

      When will climate alarmists get it through their thick skulls that centuries long periods of warming are evidence of climate change only, they are not evidence that CO2 is the cause.

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