Or if you prefer, it is 27 years since the Club of Rome published "Limits to Growth".
Jeremy Leggett, writing in the Indie, quotes Gillian Tett, writing about how the financial experts failed to notice what was going on with the derivatives market. Elites exert "ideological domination" to maintain power, and determine what can be discussed in the public sphere, and what will be dismissed as idealistic woolly hatted conspiracy theory nonsense.
For 30 years the Green Party have been speaking sweet reason about the need to challenge the world's manic belief that it is possible to expand forever in a limited space. We have to continue with this reason, but at the same time, we have to appreciate that our target audience of opinion formers is not in fact driven by reason, but by irrational short term self interest. The thing that will bring about change is not intellectual argument, but reality. The limits to growth will only be generally appreciated when the train actually crashes into the buffers at the end of the track.