Meet another target of leftist repudiation, Israeli astrophysicist Nir Shariv. First he describes the steps to becoming a gloomer:
Step One Scientists for decades have postulated that increases in carbon dioxide and other gases could lead to a greenhouse effect.There are many links called "the deniers" numbered #1 thru #10. All are excellent reading. But one more paragraph...
Step Two As if on cue, the temperature rose over the course of the 20th century while greenhouse gases proliferated due to human activities.
Step Three No other mechanism explains the warming. Without another candidate, greenhouses gases necessarily became the cause.
In another study, directly relevant to today's climate controversy, Dr. Shaviv reconstructed the temperature on Earth over the past 550 million years to find that cosmic ray flux variations explain more than two-thirds of Earth's temperature variance, making it the most dominant climate driver over geological time scales. The study also found that an upper limit can be placed on the relative role of CO2 as a climate driver, meaning that a large fraction of the global warming witnessed over the past century could not be due to CO2 -- instead it is attributable to the increased solar activity.
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