I take the idea that we are capable of doing a lot of damage with our technology. I reason that once we discover the damage we are doing, we usually do something about it. However, that process of fixing our mistakes is much slower. So I reason that over time we will do more and more damage, because our technology is progressing at faster and faster rates. And the fixes will be implemented slowly. Damage will eventually accumulate and be catastrophic. After some major catastrophe, say a few hundred million people dead, we will then slow down introducing technology into the system and be much more precautious about it. However, even then there will be economists which will argue their way out of it, saying the damage caused by not growing the economy is much worse than any sort of damage caused to the environment.