Wednesday, November 15, 2006

Global Warming Roundup

Some inconvenient truths:

Christopker Monckton in The Sunday Telegraph: The sun is warmer now than for the past 11,400 years discusses the shoddy science behind the UN's 2001 report on climate change, including:

The Disappearing Medieval Warm Period Posted by Picasa

Monckton also points out a number of quetionable assumptions, all of which work in favor of global warming:

• They gave one technique for reconstructing pre-thermometer temperature 390 times more weight than any other (but didn't say so).

• The technique they overweighted was one which the UN's 1996 report had said was unsafe: measurement of tree-rings from bristlecone pines. Tree-rings are wider in warmer years, but pine-rings are also wider when there's more carbon dioxide in the air: it's plant food. This carbon dioxide fertilisation distorts the calculations.

• They said they had included 24 data sets going back to 1400. Without saying so, they left out the set showing the medieval warm period, tucking it into a folder marked "Censored Data".

• They used a computer model to draw the graph from the data, but scientists later found that the model almost always drew hockey-sticks even if they fed in random, electronic "red noise".

• The UN dated its list of "forcings" (influences on temperature) from 1750, when the sun, and consequently air temperature, was almost as warm as now. But its start-date for the increase in world temperature was 1900, when the sun, and temperature, were much cooler.