a) Imagine it would be possible to turn back the clock a hundred years. What do you think we would do differently?
b) We are naturally not able to turn the clock back, but we can learn from the past. What kind of information does the past reveal?
a) People would always have in mind how they can save energy: the car industry would have started to develop smart cars a lot earlier, architects would have designed intelligent houses years ago.
b) The past shows us that societies adapt and sometimes they just disappear. Maybe we won't survive this neither.