Where is the information?

Global Warming: a real or unreal problem?

I recently saw an interview with a man (I believe from England) who stated that the underlying reason given for global warming was a layer of gasses in the upper atmosphere that trap heat around the planet. This is the "Greenhouse effect." His statement was that all the computer models on planet temperatures was based, more or less, on this effect.

He also stated that it was all theory, but there was a scientist who has been measuring these gasses for over 20 years and that (guess what?) there is no change in them. In other words, his implication is that there is no Greenhouse around planet earth. That would mean all the computer models are incorrectly biased by a physical effect that isn't there.

I have also heard that the average temperature of the earth is based on 1) various and changing data and data points, 2) appears to match solar activity more than the computer models on Greenhouse effect, and 3) has actually gone down over the past few years.

My questions now are:
Has anyone else heard anything about this measurement of gasses to detect the Greenhouse?
Has anyone confirmed that the data collection process is standard or compatible over time?
Has anyone determined whether or not collected data has or has not been tampered with, edited, or otherwise tinkered with?
Is the planet warming or cooling?
What time span is needed to confirm anything about average planetary temperatures?
Is Pluto really not a planet? (threw that on in to see if you are watching)
Can man's activity really have any long range impact on the planet? This issues rises when some volcanic activity seems to do more over a period of time than anything we do.
Should I buy a warmer coat or can I get another 20 winters out of this one? (Being 71 puts me in much the same boat as outgoing congressmen -- I can screw up the system and never have to pay for it!)

Somebody help me with this. But the questions have to be answered directly. I'm tired of spin.