UHI

This is just one of dozens of responses to common climate change denial arguments, which can all be found at How to Talk to a Climate Sceptic. Objection: The apparent rise of global average temperatures is actually an illusion due to the urbanization of land around weather stations, the Urban Heat Island effect. Answer: Urban Heat Island Effect has been examined quite thoroughly and simply found to have a negligible effect on temperature trends. Real Climate has a detailed discussion of this here. What's more, NASA GISS takes explicit steps in their analysis to remove any such spurious…
This is just one of dozens of responses to common climate change denial arguments, which can all be found at How to Talk to a Climate Sceptic. Objection: The surface temperature record is so full of assumptions, corrections, differing equipment and station settings, changing technology, varying altitudes and more.  It is not possible to claim we know what the "global average temperature" is, much less determine any trend.  The IPCC graphs only say what the scientists want them to say. Answer: There is actually some truth to the part about the difficulties, there are many of them that…