There is no significant Urban Heat Island effect as described by that essay. See http://www.skepticalscience.com/urban-heat-island-effect.htm and http://en.wikipedia.org/wiki/Urban_heat_island#Global_warmin... for overviews.
What cinched it for me was the work of the Berkeley Earth Surface Temperature project. See http://en.wikipedia.org/wiki/Berkeley_Earth .
There is no significant Urban Heat Island effect as described by that essay. See http://www.skepticalscience.com/urban-heat-island-effect.htm and http://en.wikipedia.org/wiki/Urban_heat_island#Global_warmin... for overviews.
What cinched it for me was the work of the Berkeley Earth Surface Temperature project. See http://en.wikipedia.org/wiki/Berkeley_Earth .