Richard Muller writes of his Berkeley Earth Surface Temperature
Three years ago, I identified problems in previous climate studies
that, in my mind, threw doubt on the very existence of global warming.
Our results show that the average temperature of the Earth's land has
risen by about 1.5 degrees Celsius over the past 250 years, including an
increase of five-sixths of one degree over the past 50 years.
Moreover, it appears likely that essentially all of this rise is from
humans' emission of greenhouse gases.
The trouble is in his first three words ~ Three years ago - Richard is living in the past. Even in the past, co-author of his paper, Judith Curry, an American climatologist and chair of the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology, accused him"of trying to mislead the public by hiding the fact that BEST’s research shows global warming has stopped."(LINK)
However, a new pre-print paper has changed all that (LINK)
Assuming that no major problems are found, the pieces of the jigsaw
fit and pass the common sense test. Yes, hot air rises off concrete.
There goes half the warming trend. The most accurate thermometers in
the right places are not recording high trends. High estimates come
from combining good records with poor ones then adjusting that up.
They show Mueller and BEST’s latest exaggerated claims of 1.5C are meaningless.
They show that only class 1 and 2 stations (which are placed well,
not next to concrete, car-parks, or air-conditioners) give reliable data
and the warming trend from these stations is much lower than the
warming trend from Class 3, 4 or 5 stations. It’s what we always knew —
thermometers near artificial heat sources are measuring artificial
warming, but it’s not the global kind.
Mueller, BEST, GISS, Hadley and all the others should have removed
the data from poor stations entirely. No amount of statistical chicanery
can correct the artificial warming effect no matter how you adjust,
blend, or homogenize the data.
Worse, the adjusted data shows an even warmer trend than
the warmest and worst stations. That casts a very dark shadow indeed.
How honest or impartial are the scientists who adjust data from stations
with thermometers near air-conditioners and create more
warming? Bad stations have been adjusted up, instead of down, and then
the good stations were adjusted up to match the now-really-awful-bad
ones. The stench of failure and a lack of dedication to the truth in on
You don’t need a PhD to know that thermometers placed in car parks are not measuring global warming.