Global warming may be real, although if it is, it's pretty minor and the earth is always either having a warming or cooling climate. We have regular, cyclical ice ages even in times when CO2 has been massively in excess of what it is now.
1970's I remember a big scare because we were heading towards the next Ice Age, which was overdue - then bless me old Michael Mann and his discredited "Hockey stick graph" - ( yes the same one as in the "Al Gore" stupidity )popped up and related the "Increase in temperature" from the end of the "Little Ice age" to the 80's to an increase in CO2 (he said) due to the Industrial revolution having pushed the CO2 content of the Atmosphere up from just over 3 parts in 10,000 to "nearly 4 parts in ten thousand" an increase of less than 1 part in 10,000 which is a miniscule 0.001 %.
A great many borderline "scientists" (whatever that means) jumped on the bandwagon gravy train . and started the race to produce computer programmes to demonstrate the most scary "Forecasts" of What would happen if the events they said had happened - were projected into the future. (Al Gore's video is the result of quite a good one ! 
)
As I think @Clint said earier, the fact that Mars (and also Jupiter) were increasing in temperature was totally ignored) There was a huge reliance placed on the fact that Venus was very hot and had "CO2" in it's atmosphere - but that was then shown to be because of a massive underestimation of the age of that planet . Then that too died a death.
Then there was that complete debacle over the conspiring e-mails from University of East Anglia et al, which as also been "Massaged away".
There has never been a reasoned and demonstrated proof that CO2 is in any way responsible, for what may or may not be a Raising of temperature from the end of teh "Little Ice age" (WHich incidentally was "smoothed away" in the figures presenntd by "Mann " and others, as was the "Medieval warm period" when England had a climate more akin to Mediteranean perhaps - without any "Man made CO2" at all !
It's cobblers ! - BUT the lie has been manipulated and used to line the pockets of a huge industry and a whole new "Science" - WIth professorships, grants, Bursaries etc etc all queueing up to be harvested.
Nowadays every layman "knows" it's true and by manipulating well meaning but gullible celebrities like "Attenborough" who really should be let out to pasture now, the "Scare" has received a credibility it certainly does not warrant. Anyone who wants to even question the vailidity fthis new "Religion" is simply told to " shut up it's clearly true - Scientists have proved it !"
But Never has there been a proper debate nor an examination of the "Hypothesis" by " independepended thinkers" - Much is made instead of "Peer reviewed documents" - well they're all getting the cash from the same places, so it's hardly surprising is it ?
A few like David Bellamy - a very knowledgeable Botanist who said "don't be silly, CO2 has been far higher in the past, without "warming" and anyhow - It's plant food - Great for feeding the starving masses" - was dumped from the TV instantly and has never been heard from again. The number of good people who have committed suicide ad had reputations and cereers wrecked for daring to ask why the Emperor was naked, is large and will never be properly known.
There has never been a chance for the arguments and counter arguments to be heard - Just guesswork stated as fact ! and all questioning ruthlessly suppressed. There are even whole websites giving the "Answers to any difficult questions" which may be asked.
This is organised manipulation of people's thoought patterns and a refusal to accept that critical thinking should have anty place in the "modern world". Our children have been indoctrinated with the new Faith and their children are being indoctrinated even as I type.
It'll be interesting to hear the words "Global Warming" Denied as the world cools towards the Maunder Minimum, although it has already started with the denial that Global warming is the right phrase - "We must call it 'Climate Change' " and sure enough, that is all you now hear on TV or read anywhere !
Apparently this 10,000 pane greenhouse with 9,997 panes missing, is now going to turn into an "Insulating blanket" 
The BS the unscrupulous will come up with to protect their income eh ?
Now "Even the bell-boy is an expert on Global Warming and offerring advice !" - WHat do we do with a market in that position ? - Why SHORT IT - of course !
[Edit - in response to a question I asked elsewhere as to why, If CO2 stopped IR rays escaping, did it not stop an equivalent number in ? - I was answered that the incoming rays were of a different wavelength because the emitted waves were "bounced off", changing their wavelength, or some such response. But i note elsewhere in this thread, it seems I was lied to since the CO2 Does seem to have had that "insulating effect" according the the Zealots ! - SO that then reinstates the validity of my original question - Why does the CO2 not let less heat through from the sun and thus cancel itself out ? ]
