You need to be carefull in your selection of "experts""
harper became a punch line years ago..
Climate Misinformer: William Happer
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Quotes by William Happer
Climate Myth What the Science Says
"The contemporary 'climate crusade' has much in common with the medieval crusades."
7 October 2011 (Source)
Modern scientists, not anti-science skeptics, follow in Galileo’s footsteps.
"The frequency of extreme events has either not changed or has decreased in the 150 years that CO2 levels have increased from 270 to 390 ppm."
1 July 2011 (Source)
Extreme weather events are being made more frequent and worse by global warming.
"Carbon is the stuff of life. Our bodies are made of carbon. A normal human exhales around 1 kg of CO2 (the simplest chemically stable molecule of carbon in the earth’s atmosphere) per day."
1 July 2011 (Source)
By breathing out, we are simply returning to the air the same CO2 that was there to begin with.
"As far as green plants are concerned, CO2 is not a pollutant, but part of their daily bread—like water, sunlight, nitrogen, and other essential elements."
1 July 2011 (Source)
Through its impacts on the climate, CO2 presents a danger to public health and welfare, and thus qualifies as an air pollutant
"About fifty million years ago, a brief moment in the long history of life on earth, geological evidence indicates, CO2 levels were several thousand ppm, much higher than now. And life flourished abundantly."
1 July 2011 (Source)
When CO2 was higher in the past, the sun was cooler.
Both from skeptical science..
I know you will not follow a link, this is long so you may not read it. Shows how bad a once well thought of physicist can fall.
Another example is William Happer, a Professor of Physics at Princeton. To me, the credibility of a scientist doesn't just come from what he publishes in the literature, but also what he publishes throughout the internet as well. In the case of many of the more prominent global warming skeptics who have actual publishing experience, much of what they say on the internet is done precisely because it would never get accepted into a journal document. Nonetheless, by placing themselves in a position of authority on the subject, they also position themselves to be criticized for what they say. The same is true of me, or many other climate bloggers who now try to "teach the science."
Just who is William Happer to someone who doesn't really care much? Well, he is "the Cyrus Fogg Brackett Professor of Physics at Princeton University", which probably makes him correct concerning a lot of physical phenomena he chooses to talk about. But then you come across an article such as this (which was then reproduced at Watts Up With That, presumably for the sole reason that it is a disinformation piece).
The outline of the article is to lay to rest the "contemporary moral epidemic" surrounding "the notion that increasing atmospheric concentrations of greenhouse gases, notably carbon dioxide, will have disastrous consequences for mankind and for the planet." As one would expect from such an opening, there are also the usual references to a climate crusade, money-hungry govermnemts, greedy scientists, etc. For the next 10 paragraphs or so, Happer uses a lot of words to say absolutely nothing, except that life needs carbon and it shouldn't be regulated as a "pollutant."
Personally, I have little interest in the legality of making CO2 a "pollutant" or not. I'm quite sure different people here have their own perspective on this, but to me whether we call it a "pollutant" or a "banana" doesn't change its physical properties: CO2 is a strong greenhouse gas, and it is important in impeding how efficiently our planet loses radiative heat to space. We don't often think of CO2 as a "pollutant" on Venus, yet it still allows the planet to support temperatures well above the melting point of lead or tin.
Happer then throws in a few classical straw man attacks such as:
"CO2 levels have increased from about 280 ppm to 390 ppm over the past 150 years or so, and the earth has warmed by about 0.8 degree Celsius during that time. Therefore the warming is due to CO2. But correlation is not causation. Roosters crow every morning at sunrise, but that does not mean the rooster caused the sun to rise. The sun will still rise on Monday if you decide to have the rooster for Sunday dinner."
This would, of course, be a perfectly valid counter-argument to would-be fallacious reasoning, yet it isn't the reasoning any real scientist uses, and is therefore a smokescreen. Naturally, the WUWT crowd has eaten it up without thinking twice. The causative mechanism is the underlying radiative physics of how a CO2 molecule interacts with infrared light, and also a wide variety of indirect signatures of climate change induced by agents acting on the longwave part of the spectrum, such as stratospheric cooling or the radiative imbalance at the top of the atmosphere.
Happer can't resist throwing in a few outdated one-liners about the Vikings in a "green" Greenland, how CO2 lags temperatures in ice cores, and other boring punchlines that most skeptics don't even bother with anymore. He implies that Earth cooled by about 10 C during the Younger Dryas, but actually the YD was a time of relatively little global temperature change, even though a large area of the planet was actually being affected (see here). There's a whole list of other quick talking points about climategate, the hockey stick, etc that readers here will be well familiar with. What is most surprising to me is that a distinguished physicist apparently has no original thoughts on the matter.
Happer's reasoning is well out of line throughout his entire article, yet that doesn't stop a Princeton physicist from declaring with such confidence that this CO2-induced global warming thing is all a sham. Throughout the article he shows his unambiguous mission to confuse the reader, and his own ignorance concerning the physics of climate. He makes a number of serious accusations against a very large community, something which if unfounded (as it is surely is) should ruin the reputation of any serious scientist. Indeed, for me at least, it has. It is possible his own area of research is so far removed from climate that none of his colleagues will bother to care.
In short, even Princeton can make mistakes in who they decide should represent their department.