One of a series of three videos from the seventies worrying about a new ice age. The usual suspects are all there - visual drama, doom-laden commentary, tame experts and a celebrity - in this case Leonard Nimoy of Star Trek fame. The other two videos are here and here. h/t Gore Lied.
The third video features the late Stephen Schneider who later switched to predicting global warming and according to the same Gore Lied post had this to say to Discover magazine in October 1989.
On the one hand, as scientists we are ethically bound to the scientific method, in effect promising to tell the truth, the whole truth, and nothing but — which means that we must include all the doubts, the caveats, the ifs, ands, and buts. On the other hand, we are not just scientists but human beings as well. And like most people we’d like to see the world a better place, which in this context translates into our working to reduce the risk of potentially disastrous climatic change. To do that we need to get some broadbased support, to capture the public’s imagination. That, of course, entails getting loads of media coverage. So we have to offer up scary scenarios, make simplified, dramatic statements, and make little mention of any doubts we might have. This ‘double ethical bind’ we frequently find ourselves in cannot be solved by any formula. Each of us has to decide what the right balance is between being effective and being honest. I hope that means being both.
To my mind these are the words of an ethically naive man rather than an out and out liar, but even as I write those words I wonder if I'm being naive too.