"The greatest point of contention in the debate over “global warming” or “climate change” is not whether or not a significant increase in atmospheric carbon dioxide (CO2) would warm the planet.
Carbon dioxide is a “greenhouse gas” that is very effective at absorbing and emitting infrared radiation, and so both sides in the debate generally agree that increased atmospheric CO2 would cause moderate warming, if everything else in the climate system were to stay the same....The real issue centers around this question:
How sensitive is the climate to changes in atmospheric CO2?
Those who are very concerned about global warming believe that climate “feedbacks” would enhance warming due to increased atmospheric CO2, possibly to dangerously high temperatures.
...Lewis and Curry concluded that climate sensitivity is relatively low...
Although this is by no means the first published estimate of climate sensitivity, Dr. Spencer noted that it was significant for two reasons.
First, the result was published in a well-known “mainstream” journal.
Second, Lewis and Curry took great pains to address the uncertainties and possible objections to their calculations...
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