Young earth creationism is used as an excuse to oppose environmental protection.
This is OFTEN the case. But even some YEC folks are changing their views on environmentalism.
They used to say, "The world is gonna burn up some day at the end of time and the Lord is gonna create a new earth." (So I use their own theology on them.)
"Okay fine. The world is going to burn up some day. So are you. And the Lord will give you a new body, right? Well...I bet you still brush your teeth. " In other words, you take care of what the good Lord has given you. You owe it to the Lord, to yourself and to those who depend on you. It's no less applicable to our environment.
Of course, there's an even better response. Psalm 26:1. "The earth is the Lord's and everything that is in it."
To me, this means it's His. It's not mine. And if He entrusted me with it, I'd better not muck it up too badly. Those whales and polar bears may mean nothing to me. But they belong to my Father. They are supposed to show forth His glory. If they are dying out, and I've not tried to stop that, then I am helping to silence or elminate another created thing that supposedly shows how wonderful the creator is.
Anyway, those are a couple of counterarguments that I have found effective with some of the more sincere, devout YEC folk