9a)

We think they wouldn’t do anything different, because the human race is too lazy to change anything. And most people aren’t changing anything now, so why would they do it in the past if they knew what would happen?

But if we could decide what to do, we would probably save on crude oil as good as we can, and we would use renewable energies (like wind, water, sun, tide, geothermic warmth, and so on) as much as we can.

9b)

Nature gives us everything we have, therefore we really should care about what’s good for the nature and shouldn’t exploit it.