The climate models use air temperature for the whole globe, whereas the real - world data used by scientists are a combination of air and sea surface temperature readings. (sciencedaily.com)
The chart shows zero error for modern surface temperature readings. (climate-skeptic.com)
We still have 50 years of surface temperature readings show warming trends over the parts of the Earth where we've been measuring. (dotearth.blogs.nytimes.com)