I don't know if this is constructive but here goes: Petroleum probably wasn't a great application for a lot of applications either, especially considering the

I don't know if this is constructive but here goes: Petroleum probably wasn't a great application for a lot of applications either, especially considering the by-product is Co2, oil spills etc; However, we've used it for hundreds / thousands of years in many different ways and it's been ok. I don't know how long we're going to wait, but we need to using petroleum tomorrow, and be very very pragmatic about it.