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I have not seen anyone claim that there has been cooling for two decades. The claim is that there has been cooling during the last eight years (Bush's fault!). I think it is too soon to claim the data prove that yet, but it is clearly possible since the lastest solar cycle was 152 months long, 27 months longer than the average cycle. According to Lassen's analysis, this would be associated with a 0.7C/ 1.25F DROP of Earth's temperature.

Here is a link to a display of the MOST ACCURATE records we have of Earth's temperatures: the Satellite data since 1978. Notice that temperatures may well have leveled off around 2001-2003 after rising 0.2C the previous two decades, and it is easily supportable that we are in a cooling trend since then, which would be consistent with Lassen.

Here are some historical charts from his article, which is also consistent with the Met Office data already linked by someone else, but show the solar activity:

This is completely ignored by the Alarmists because they don't understand how "minor" increased solar activity (which cycle length is a proxy for) can be "amplified" in its initial, trivial effects. Svensmark's proposal of cosmic ray influences are likely to solve at least part of that, though Cristy's analysis of feedback involving equatorial cloud formations have a similar amplification effect. The alarmists have mysterious multipliers for CO2's influence built in to their models, which appear to several factors too high, but they refuse to allow a similar mysterious multiplier for solar influence despite Lassen's clear demonstration in this paper.

www.wattsupwiththat.com

and

www.icecap.us

have excellent, day-to-day updates and plots and research papers challenging the AGW hysteria and propaganda.

www.co2sciecne.org also has hundreds of papers showing the CO2 side of the house - particularly with respect to the plants and atmosphere conditions.