I’m a denier for several reasons. There is no substantive evidence that the planet has warmed significantly or that any significant warming will occur in the future. If any warming does occur, it likely will be concentrated at higher latitudes and therefore be beneficial. Climate research has largely degenerated into pathological science, and the coverage of global warming in the media is tendentious to the point of being fraudulent. Anyone who is an honest and competent scientist must be a denier.
Have you ever considered how difficult it is to take the temperature of the planet Earth? What temperature will you measure? The air? The surface of the Earth absorbs more than twice as much incident heat from the Sun than the air. But if you measure the temperature of the surface, what surface are you going to measure? The solid Earth or the oceans? There is twice as much water as land on Earth. If you decide to measure water temperature, at what depth will you take the measurements? How will the time scale on which the deep ocean mixes with the shallow affect your measurements? And how, pray tell, will you determine what the average water temperature was for the South Pacific Ocean a hundred years ago? How will you combine air, land, and sea temperature measurements? Even if you use only meteorological measurements of air temperature, how will you compensate for changes in latitude, elevation, and land use?
Determining a mean planetary temperature is not straightforward, but an extremely complicated problem. Even the best data are suspect. Anthony Watts and his colleagues have surveyed 82.5 percent of stations in the U.S. Historical Climatology Network. They have found – shockingly – that over 70 percent of these stations are likely to be contaminated by errors greater than 2 deg C [3.6 deg F]. Of the remaining stations, 21.5 percent have inherent errors greater than 1 deg C. The alleged degree of global warming over the past 150 years is less than 1 deg C. Yet even in a technologically advanced country like the US, the inherent error in over 90 percent of the surveyed meteorological stations is greater than the putative signal. And these errors are not random, but systematically reflect a warming bias related to urbanization. Watts has documented countless instances of air temperature sensors located next to air conditioning vents or in the middle of asphalt parking lots. A typical scenario is that a temperature sensor that was in the middle of a pasture a hundred years ago is now surrounded by a concrete jungle. Urbanization has been a unidirectional process. It is entirely plausible – even likely – that all of the temperature rise that has been inferred from the data is an artifact that reflects the growth of urban heat islands.
The “denier” is portrayed as a person who refuses to accept the plain evidence of his senses. But in fact it is the alarmist who doesn’t know what they are talking about. The temperature of the Earth and how it has varied over the past 150 years is poorly constrained. The person who thinks otherwise does so largely because they have no comprehension of the science. Most of these people have never done science or thought about the inherent difficulties and uncertainties involved.