A frequent claim in the climate change debate is that a “consensus” or even “overwhelming consensus” of scientists embrace the more alarming end of the spectrum of scientific projections of future climate change.
The global warming debate is one of the most consequential public policy debates taking place in the world today. Billions of dollars have been spent in the name of preventing global warming or mitigating the human impact on Earth’s climate. Governments are negotiating treaties that would require trillions of dollars more to be spent in the years ahead.
Politicians including President Barack Obama and government agencies including the National Aeronautics and Space Administration (NASA) claim “97 percent of scientists agree” that climate change is both man-made and dangerous.
The claim of “scientific consensus” on the causes and consequences of climate change is without merit. There is no survey or study showing “consensus” on any of the most important scientific issues in the climate change debate. On the contrary, there is extensive evidence of scientific disagreement about many of the most important issues that must be resolved before the hypothesis of dangerous man-made global warming can be validated.