However, you fail to take into account that the data that had been collected in the 70's was incomplete, and that computer modeling has advanced quite a bit since then.
It is unfortunate that climatology has been hijacked by the environmental left and politicized to the extent it has. There is a nutural variation in climate within historical times (remember Vinland in Canada...I don't think they grow grapes in Labrador now). Periods of global warming have occurred before industrialization, and periods of cold (the "Little Ice Age" of the Middle Ages) have occurred as well.
It is quite likely that we may beginning a warming period INDEPENDENT of what man does. It might be that man's contribution accellerated the cycle by 1%. (Big deal.)
The thing to do is to begin to use real science, NOT bogus reports, anecdotes, and what-ifs. A responsible conservative would make a decision based on FACTS, not on what we WISH.
Rush Limbaugh has no science training. His comments on global warming are simply the political position he takes based on what he wants the answer to be. This is no different than the attitude of the Catholic Church to Galileo's studies.
It is foolish to take a scientific position based on political preference. If you are finally proved wrong, you look like an ignoramus.
This is where the difficulty is with decent analysis of the environment. There were no issues of industrial pollution, smog from cars, other manmade factors affecting the environment during these early extremes. At some point, pollution causes the extremes in climate to be even worse, causes disease, causes permanent change to the environment.
In Chaos Theory in Math even small changes in input can cause large, unpredicatable changes in the future...or not. It has to do with unforseen interactions. We really don't know how, in the long term, anything new is going to affect the environment, or the economy, or society, or anything else.
I agree with your assessment of the report. I don't think Bush has flip-flopped... but some people believe the headlines and do not care to read further...