It ain’t over ’til the Scientific Method stops screaming


1-
Climate of Opinion
“The latest U.N. report shows the “warming” debate is far from settled.”


…U.N. scientists have relied heavily on computer models to predict future climate change, and these crystal balls are notoriously inaccurate. According to the models, for instance, global temperatures were supposed to have risen in recent years. Yet according to the U.S. National Climate Data Center, the world in 2006 was only 0.03 degrees Celsius warmer than it was in 2001–in the range of measurement error and thus not statistically significant.

The models also predicted that sea levels would rise much faster than they actually have. The models didn’t predict the significant cooling the oceans have undergone since 2003–which is the opposite of what you’d expect with global warming. Cooler oceans have also put a damper on claims that global warming is the cause of more frequent or intense hurricanes. The models also failed to predict falling concentrations of methane in the atmosphere, another surprise.

This isn’t really a surprise, Not only do these computer models not get the last few years right, they cannot even predict the past.

2-
An astrophysicist changes his mind.

The real deal?

“Against the grain: Some scientists deny global warming exists”


Astrophysicist Nir Shariv, one of Israel’s top young scientists, describes the logic that led him — and most everyone else — to conclude that SUVs, coal plants and other things man-made cause global warming.

Step One
Scientists for decades have postulated that increases in carbon dioxide and other gases could lead to a greenhouse effect.

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.

Dr. Shariv, a prolific researcher who has made a name for himself assessing the movements of two-billion-year-old meteorites, no longer accepts this logic, or subscribes to these views. He has recanted: “Like many others, I was personally sure that CO2 is the bad culprit in the story of global warming. But after carefully digging into the evidence, I realized that things are far more complicated than the story sold to us by many climate scientists or the stories regurgitated by the media.

“In fact, there is much more than meets the eye.”

3-
A climatologist objects.

Global Warming: The Cold, Hard Facts?


…Believe it or not, Global Warming is not due to human contribution of Carbon Dioxide (CO2). This in fact is the greatest deception in the history of science. We are wasting time, energy and trillions of dollars while creating unnecessary fear and consternation over an issue with no scientific justification. For example, Environment Canada brags about spending $3.7 billion in the last five years dealing with climate change almost all on propaganda trying to defend an indefensible scientific position while at the same time closing weather stations and failing to meet legislated pollution targets.

…Since I obtained my doctorate in climatology from the University of London, Queen Mary College, England my career has spanned two climate cycles. Temperatures declined from 1940 to 1980 and in the early 1970’s global cooling became the consensus. This proves that consensus is not a scientific fact. By the 1990’s temperatures appeared to have reversed and Global Warming became the consensus. It appears I’ll witness another cycle before retiring, as the major mechanisms and the global temperature trends now indicate a cooling.

4-
An independent summary from the Fraser Institute shows that the scientific evidence about global warming remains uncertain. The main points:


• Data collected by weather satellites since 1979 continue to exhibit little evidence of atmospheric warming, with estimated trends ranging from nearly zero to the low end of past IPCC forecasts. There is no significant warming in the tropical troposphere (the lowest portion of the Earth’s atmosphere), which accounts for half the world’s atmosphere, despite model predictions that warming should be amplified there.

• Temperature data collected at the surface exhibits an upward trend from 1900 to 1940, and again from 1979 to the present. Trends in the Southern Hemisphere are small compared to those in the Northern Hemisphere.

• There is no compelling evidence that dangerous or unprecedented changes are underway. Perceptions of increased extreme weather events are potentially due to increased reporting. There is too little data to reliably confirm these perceptions.

• There is no globally-consistent pattern in long-term precipitation trends, snow-covered area, or snow depth. Arctic sea ice thickness showed an abrupt loss prior to the 1990s, and the loss stopped shortly thereafter. There is insufficient data to conclude that there are any trends in Antarctic sea ice thickness.

• Current data suggest a global mean sea level rise of between two and three millimeters per year. Models project an increase of roughly 20 centimeters over the next 100 years, if accompanied by a warming of 2.0 to 4.5 degrees Celsius.

• Natural climatic variability is now believed to be substantially larger than previously estimated, as is the uncertainty associated with historical temperature reconstructions.

• Attributing an observed climate change to a specific cause like greenhouse gas emissions is not formally possible, and therefore relies on computer model simulations. These attribution studies do not take into account the basic uncertainty about climate models, or all potentially important influences like aerosols, solar activity, and land use changes.

• Computer models project a range of future forecasts, which are inherently uncertain for the coming century, especially at the regional level. It is not possible to say which, if any, of today’s climate models are reliable for climate prediction and forecasting.

The full text of the summary (64 pages, pdf), here:
Independent Summary for Policymakers
IPCC Fourth Assessment Report

You should read all of the links.

Comments