Yeah, the Climategate scandal. It exposed a lot of the dishonesty and open discussion of how to contort data to make it seem like AGW is happening. There are also other facts that show many of these thermometers are placed next to things that emit heat (like heating units, blacktop pavement, etc).
No, that's not what happened with "climategate." That's what Fox News
told you happened. If anyone on the right wing had bothered to make even a cursory check on the context of that email, they would have known that "the decline" being referred to was not global temperatures but rather the
apparent temperature as shown by tree ring temperature proxies. The tree ring proxies deviate from known temperatures after about 1960 or so. Much discussion and research is ongoing as to why exactly this happens, since tree ring proxies match very well with the rest of the known temperature record as well as the other temperature proxies over the last 1000 years. (prevailing theories are that either increases in acid rain, ozone depletion, or a combination of the two slightly stunted tree growth in the upper lattitudes of the northern hemisphere, causing this apparent temperature decline) This information was publicly available in the very paper referred to in that "hide the decline" email.
Six different investigations into the "scandal" all concur that no fraud occurred.
As for the effects of poor siting of temperature stations, this one is also easily disproven. Anthony Watts, a prominent skeptic, ran a group of volunteers who photographed stations all around the country showing bad siting. It's true, many stations are not placed in accordance with the standards. (or they were placed correctly but later new construction brought them out of compliance) His group rated the stations on a scale of "best" to "poor." So, the NOAA decided to investigate the impact of Watts' research and accusations. They reran the temperature record using only the stations Watts' team rated "best" or "good." And again using only stations labeled worse than that. ("fair" or "poor" i think) And again using a newer-but-smaller network of more advanced stations placed deliberately far from civilization. Each time, the data comes back nearly identical. In fact, the "poor" stations, rather counter-intuitively, introduce a
cooling bias into the data, not a warming bias. Watts' team made some accusations but never bothered to check on the impact of the situation.
I've posted links that prove this numerous times. Do you need to see it again?