The fact is, there is and always has been, and always will be, natural climate change, but the contribution of human activity is necessarily so minuscule as to be nearly undetectable. Here’s why:
Carbon dioxide, considered the main vector for human-caused global warming, is 0.039% of the atmosphere- a trace gas. Water vapor varies, but averages around 1%, and is about ten times more effective a greenhouse gas than carbon dioxide. So water vapor is about 25 times more prevalent and ten times more effective; that makes it 250 times more important to the greenhouse effect than carbon dioxide. The TOTAL contribution of carbon dioxide to the greenhouse effect is therefore about 0.004%. The total human contribution to carbon dioxide since the start of the industrial revolution has been estimated at about 25%. So human greenhouse effect is a quarter of 0.00%, works out to about 0.001%. Since TOTAL greenhouse effect on temperature is estimated at around 63 degrees Fahrenheit, that would come to human-caused warming of about 0.063 degrees Fahrenheit.
But that’s only the beginning. We’ve had global warming for at least 10,000 years, since the end of the last Ice Age. Whatever caused that, it was not human activity. It was not all those power plants and factories and SUVs being operated by Stone Age cavemen while chipping arrowheads out of bits of flint. Whatever the cause was, it caused the glaciers, which once extended south to Long Island and the northern suburbs of New York City, to not only melt back, but completely disappear (except for a few mountain remnants). That’s one big greenhouse effect! If we are still having global warming — and I suppose we should presume we are, given a 10,000 year trend — it is as close to a certainty as one can get that it is still the overwhelmingly primary cause of continued warming, rather than our piddling 0.001% contribution to the greenhouse effect.
The science is now all-but-settled on global warming. Convincing new evidence demonstrates cosmic rays and the sun — not human activities — as the dominant controller of climate on Earth. The research, published with little fanfare in the prestigious journal Nature, comes from über-prestigious CERN, the European Organization for Nuclear Research. They demonstrate that cosmic rays promote the formation of molecules that in Earth’s atmosphere can grow and seed clouds, the cloudier and thus cooler it will be. Because the sun’s magnetic field controls how many cosmic rays reach Earth’s atmosphere (the stronger the sun’s magnetic field, the more it shields Earth from incoming cosmic rays from space), the sun determines the temperature on Earth.
Yet even that trend-continuation still needs to be proved. Evidence is that the Medieval Warm Period in the 1200s was somewhat warmer than we are now, and the climate was a lot colder in the Little Ice Age in the 1600s than it is now. So we are within the range of normal up-and-down fluctuations without human greenhouse contributions that could be significant, or even measurable.
The principal scientists arguing for human-caused global warming have been demonstrably disingenuous, and now you can see why. They have proved they should not be trusted.
For an entertaining and devastating critique of the alleged “science” behind the AGW argument, check out this video:
Richard Muller is a physicist at the University of California campus at Berkeley (!). He is a bit of a showman, but he is also a serious scientist.
The idea that we should be spending billions upon billions of dollars to reduce carbon dioxide emissions is beyond ludicrous in light of the facts above; it is insane. The true motivation underlying the global warming movement is almost certainly ideological and political in nature, and I predict AGW, as currently preached, will go down as the greatest fraud of all time. It makes Madoff and Ponzi look like pikers by comparison