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There Is No Evidence

2009/07/13 1 comment

From Icecap why Global Warming Clearinghouse, here’s an intro to “There is no evidence” by Dr David Evans:

Let’s break down the case for human-caused global warming logically:

1) There is plenty of evidence that global warming has been occurring recently.
2) There is ample evidence that carbon emissions causes warming and that the level of atmospheric carbon dioxide is increasing.
3) But there is no evidence that carbon dioxide emissions are the main cause of the recent global warming.

The alarmists focus you entirely on the first two points, to distract you from the third. The public is increasingly aware of this misdirection. Yes, every emitted molecule of carbon dioxide (CO2) causes some warming – but the crucial question is how much warming do the CO2 emissions cause? If atmospheric CO2 levels doubled, would temperatures rise by 0.1, 1.0, or by 10.0C?

We go through the usual “evidence” offered by alarmists, and show that in each case either it:

• Is not evidence about what causes global warming. Proof that global warming occurred is not proof that CO2 was mainly responsible.
• Is not empirical evidence; that is, it is not independent of theory. In particular models are theory, not evidence.
• Says nothing about how much the temperature would rise for a given rise in CO2 levels.

[…]  If they just had some evidence of (3) they could just tell us what it was and end the debate.

[…] Typical Alarmist Offerings of “Evidence”: Polar Bears, Glaciers, Arctic Melt, Antarctic Ice Shelves, Storms, Droughts, Fires, Malaria, Snow Melt on Mt Kilimanjaro, Rising Sea Levels, Ocean Warming, Urban Heat Island Effect. Although each of these issues may say something about whether or not global warming is or was occurring, none of them say anything about the causes of global warming. It would make no difference to these issues if the recent global warming was caused by CO2 or by aliens heating the planet with ray guns.[…] Often the assumption takes the form that nearly all the temperature rises since the start of industrialization are due to CO2 rises, or that there are no other possible significant causes of global warming.

Computer Models are Evidence
Computer models consist solely of a large number of calculations that, individually, you could do on a hand-held calculator. So models are theoretical, and cannot form part of any evidence.

Computer Models Incorporate a Lot of Sound Empirical Science
Yes they do. The climate models contain some well-established science that has been verified by empirical observations. But they also contain a myriad of:
• implicit and explicit assumptions
• omissions
• guesses
• gross approximations.

A single mistake in any one of these can invalidate the climate models. Typical engineering models that mimic reality closely contain no untested assumptions, material omissions, guesses, or gross approximations. They are the result of mature understanding of the reality being modelled, and have been tested ad nauseum in a wide range of circumstances. On the other hand, climate science is in its infancy, individual models routinely fail most tests, the climate models are riddled with untested assumptions and guesses, they approximate the atmosphere with cells a hundred kilometres square and hundreds of meters high, and they do not even attempt to model individual cloud formations or any feature smaller than the cell size. Don’t let the word “model” fool you into thinking climate models are better than they are.

Meanwhile in the Real World…

2008/08/12 1 comment

Bangladesh gaining land, not losing: scientists

DHAKA, July 30 (AFP) Jul 30, 2008
New data shows that Bangladesh’s landmass is increasing, contradicting forecasts that the South Asian nation will be under the waves by the end of the century, experts say.

[…] The United Nations Intergovernmental Panel on Climate Change (IPCC) has predicted that impoverished Bangladesh, criss-crossed by a network of more than 200 rivers, will lose 17 percent of its land by 2050 because of rising sea levels due to global warming.

The Nobel Peace Prize-winning panel says 20 million Bangladeshis will become environmental refugees by 2050 and the country will lose some 30 percent of its food production.

Director of the US-based NASA Goddard Institute for Space Studies, professor James Hansen, paints an even grimmer picture, predicting the entire country could be under water by the end of the century.

But Sarker said that while rising sea levels and river erosion were both claiming land in Bangladesh, many climate experts had failed to take into account new land being formed from the river sediment. […]

Obviously AGW believers will re-iterate that the above observation does not disprove anything, yada, yada, yada. Who knows, perhaps at least one free soul among them will start to reconsider the veracity of fashionable catastrophism.

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