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1. Many != all
2. Weather satellites collect temperature data globally.
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I don't think a weather satellite can measure the temperature 22,000 below their orbit with enough accuracy to be used for global warming data. Infra-red, though useful, has its limitations. If so, then we can close all temperature stations around the world and just use satellite data. But there must be a reason to keep these weather stations open instead of relying on satellite data which would be MUCH easier. I didn't see anything from wiki to confirm or deny this...
http://en.wikipedia.org/wiki/Weather_satellite
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From the link you posted
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The thermal or infrared images recorded by sensors called scanning radiometers enable a trained analyst to determine cloud heights and types, to calculate land and surface water temperatures, and to locate ocean surface features. These infrared pictures depict ocean eddies or vortices and map currents such as the Gulf Stream which are valuable to the shipping industry. Fishermen and farmers are interested in knowing land and water temperatures to protect their crops against frost or increase their catch from the sea. Even El Niņo phenomena can be spotted. Using color-digitized techniques, the gray shaded thermal images can be converted to color for easier identification of desired information.
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