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Only about 1 in 10 surface weather stations is sufficiently properly sited to produce data accurate to within 1 deg. C.

The urban heat island effect and 'micro-climates' have a negligible impact on long term warming trends, especially when records are averaged over large areas. Also, rural temperature records show the same warming trends as urban ones. The 'evidence' on this site isn't relevant to arguments regarding the existing of global warming.

Exactly. You can use the Climate Reports to lasso areas away from urban centres in the map:

http://whitemagicsoftware.com/software/climate/guru.shtml

The site says nothing about global warming or the cause. The site does show that there is a consistent warming trend over summer months across all of Canada, and is most extreme in northern Canada. Also, I believe the Environment Canada data is accurate to within 0.2 degrees C.

...in the US.

If you imagine that Canadian surface stations are sited altogether differently then you're living in a fantasy world.

I'm not imagining anything, just increasing the accuracy of your statement - I think accuracy is important when it comes to climate science.

"...in the US" doesn't increase accuracy.

"...in the US; here's a good study on the subject:" would.

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