Changes

*[[Thermometer]]s that were once in rural areas are now surrounded by buildings which causes a 'heat island effect' which makes the [[reading]]s unreliable as there is another [[variable]] which has affected their [[temperature]] [[reading]]s.

*Old [[thermometer]]s were far less [[accurate]] than modern [[thermometer]]s. Some [[scientist]]s believe this is what caused an apparent halt in '''global warming''' over the last decade and in fact '''global warming''' didn't stop, we just got better [[thermometer]]s.