I look at the data and I look at the science. Both are questionable. The long term record is a joke. Try looking at the GISS (NASA) data. It's not a pretty sight. They claim accurate data going back to January 1880. Their January 1880 data includes 2 temperature measurements for the continent of Africa. One looks to be Algeria and the second to be the island of Sao Tome something like 100 miles off the coast. Neither South America or Antarctica had any coverage yet we are expected to believe their numbers are accurate. Only Europe was largely covered. The US was but the rest of North America was generally empty.
http://data.giss.nasa.gov/cgi-bin/gistemp/do_nmap.py?year_last=2009&month_last=04&sat=4&sst=0&type=anoms&mean_gen=01&year1=1880&year2=1880&base1=1951&base2=1980&radius=250&pol=regThis map shows what the temperature anomaly was in a 2 degree longitude by 2 degree latitude grid. I choose the smaller of the two options. This is anything within 250 kilometers (150 miles) on either side. That's like saying that you can tell the temperature of Washington DC by standing in Central Park (New York City).
But it gets worse. They will allocate a temperature to an entire grid if there is a measurement within 250 km. Lets go back to Sao Tome. A 250 km radius around a point is 196,250 square km. Because they assign a temperature to every grid that even barely overlaps the 250 km radius that number grows massively.
They assign 12 2 X 2 grids to Sao Tome. They total about 593,141 sq km. All for one thermometer and we are expected to believe that they know the temperature within a tenth of a degree. Lets not even talk about the quality of the data.
If you believe the models fine (I don't) but the actual data sucks.