This is the Short Version of the Weather Channel report on the Global Warming hoax.

Basically the hoax started in 1990 when global weather data collection points went from 6000 data points to 2000 data points.
Most of these 4000 dropped data points were in the "Colder" region of the globe. So with less "Colder" reporting regions, the "Hotter" the temperatures became.
You can watch this video as it progresses from the 1950's until 2000. Watch closely as the black dots suddenly disappear around the year 1990, when over 4000 temperature data point were dropped. Look where the data point are, in the colder regions.

Global Warming Hoax Video 
(Depending on your connection speed, this may take a minute or so, be patience.)