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Is it a result of climate change or something else? Part 1.

(Read caption) A Canadian astronaut said that he observed more melting glaciers on his trip into space this year than he had on his pervious trip in 1996.

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This week, the Web is abuzz with climate-related news: An astronaut commented that humankind's impact on Earth was visible from space; the UN climate chief visited Mongolia, a semiarid country undergoing rapid desertification, to talk about climate change; and the New Scientist magazine reported that the Fertile Crescent "will disappear this century."

Maybe it's worth stepping back for a second to ask: How many of the changes we see happening around us are really attributable to climate change?

To preface: I'm not denying that human-released greenhouse gases are changing Earth's climate. At this point, the science points overwhelmingly in that direction.

But climate change is, by definition, a long-term trend, and, as scientists are often at pains to explain, while long-term trends are derived from multiple data points, it's hard to attribute any single data point to the trend itself.

In other words, the climate may be warming and the cherry blossoms may have come early this year, but it's impossible to say with certainty that this year's early cherry blossoms are due to human-induced climate change. There are too many other confounding factors.

And yet, that's often what happens. There are myriad possible reasons why, but in the end, the "blame climate change" tendency may simply be the result of how our minds work.

Climate change is weighing heavily on the collective mind right now, and with good reason: We've got one planet; better not mess it up. But the saturation of our awareness by climate change may also cause certain errors of judgment. Psychologists call it a "confirmation bias." They've repeatedly documented that people tend to see what they expect to see.

Science Daily gives this definition:

In psychology and cognitive science, confirmation bias (or confirmatory bias) is a tendency to search for or interpret information in a way that confirms one's preconceptions, leading to statistical errors.

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