I think this is more insightful, or at least interesting, than replies are giving credit. Sure, you know your temperature from the thermometer at your house, but how do you measure the world's temperature? What is included and excluded in the calculation? Scientific facts don't exist in isolation - they are created in people processes in a political environment. New and existing metrics can be cited or withheld to support an agenda. Anyhow, given this specific case is from a single source, it seems to be at least self-consistent.