Your question is rather hard to answer, because climate change has actually been known about for decades (including before videos were common!) Here’s a timeline about global warming history: http://www.aip.org/history/climate/timeline.htm
When questions about global warming first started rising in the 70s (pun intended, ha!) videos like “The Greening of PLanet Earth” started coming out. This video seems like a good scientific basis for encouraging climate change, but it was actually funded by the American Petroleum Institute (the oil industry!)
Does not necessarily answer your question, but it’s an early video and it’s certainly interesting to watch and see what private interest can do with scientific facts.
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