I don't think it's fair to compare the specific, fairly measurable consequences of not fully considering how to "prevent highly poisonous gas from escaping from the factory" vs. the more vague and complex environmental impact of a delay in car production.

But lets put that aside and let me ask you this:

What amount of delay would you be ok with in addressing environmental concerns?

As little delay as reasonably possible.

"reasonable" is pretty much meaningless. How do you determine what is "reasonable"? Who determines that?