In the 1970's science was sure man was causing the next ice age. What lessons can be learned from this hysteria?

Update: This question seems to have triggered someone, probably Tribeca. The question keeps getting moved by someone who cannot handle it.
Update 2: Is this what happens when liberals are presented with facts that do not fit into their preconceived notion of "truth". They attack and push away what does not go along with their current understanding instead of adapting and learning?
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