This is clearly _A_ reason why many people have a hard time understanding this. Is it the biggest one?
People experience the local weather, not the global climate. You can't see or feel global warming. To understand it, you have to look at the global climate data. Easy for a scientist, who finds the data very compelling, harder for a layman. People's senses give them information about local weather, not global climate.
Relying on data, rather than their own senses, is hard for a layman, particularly if you don't trust scientists. But in this case the reach of our senses, in space and time, is inadequate to grasp global warming. And so we get tied in knots talking about the weather here, when it's just a side issue.
In order to know the truth about global warming, you MUST look at the data. Check out this graph. The black jaggies are dominated by weather changes. The red (5 year average) line is what the climate is doing.
http://data.giss.nasa.gov/gistemp/2007/
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