It is a common trick to forecast the future on the assumption of no technological change, and find it dire. This is not wrong. The future would indeed be dire if invention and discovery ceased. As Paul Romer puts it: 'Every generation has perceived the limits to growth that finite resources and undesirable side effects would pose if no new recipes or ideas were discovered. And every generation has underestimated the potential for finding new recipes and ideas. We consistently fail to grasp how many ideas remain to be discovered.' By far the most dangerous, and indeed unsustainable thing the human race could do to itself would be to turn off the innovation tap.