There wasn't any hockey stick prior to the year 2000.
The 1990 IPCC report showed that temperatures were much cooler than 800 years ago.
Briffa's trees showed a sharp decline in temperatures after 1940
The 1975 National Academy Of Sciences report also showed a sharp decline in temperatures after 1940
NCAR reported a sharp drop in temperatures after 1940…
This post by Steven Goddard brings together a number of pieces of evidence that "real world" data has been systematically adjusted to fit the theory. BEWARE THE FLASHING GRAPHS LOWER DOWN.This is only the second time I have reblogged somebody else’s work in the four years my blog has been running. The reason is that I often observe lots of pieces of evidence that suggest bias, but rarely are some of the pieces of evidence put together to corroborate each other. Other bits of evidence (from memory) 1. The Darwen, Australia temperature record. 2. The temperature record for New Zealand. 3. The temperature record for Australia – which has recently be replaced to evade an external audit. 4. The HADCRUT temperature series being brought into line with GISSTEMP to save having to hide the divergence.http://manicbeancounter.com/2011/04/05/nasa-excludes-an-inconvenient-figure-on-2010-temperatures/ It is not just ex-post adjustments of individual temperature series that creates an artificially large warming trend. There are also the statistical methods used to determine the “average” reading.