Even simpler and less convenient

From this British site:

Everyday in the news, we hear of the threat of climate change. There are international conferences, television documentaries, books galore.

(and an Academy Award and a possible Nobel Peace Prize)

But there is a danger whose consequences will be far more destructive and which will hit us much sooner. It is a danger that will effect everybody, rich or poor, wherever they live in the world. It will require enormous financial and scientific strides to defeat, strides which the world’s governments show few signs of taking. It is a danger which, quite feasibly, could lead to the end of our industrial civilisation. It is the danger of peak oil.

From another British site, here's an overview of the subject.