Personsally I use green energy, eat vegetarian (not vegan, but noboy is perfect), own no car, live in cooperative housing, support green socialist parties and so on. There´s a lot you can do if you just want it.
There are colliding interests in the world and you must raise your voice when you want yours to be considered. Environmental destruction and alienation from nature are no misunderstanding or accident; they follow political and cultural trends. As an artist you can support them, or you can show an alternative.
I don't think that anyone should be forced to do anything he/she doesn't like to do. Of course, saving our environment should be everyone's responsibility but not necessarily through art. You could donate to some environmental organisation or vote or something else. The possibilities are endless
An artist has to draw what they know. Just like writers have to write about what they know. While it would be great to see more artists create images to help contribute to protecting the enviroment, we cannot expect everyone to do it.
Let's stop saving the environment, and let's save ourselves instead! This planet has been destroyed many times, and has no feelings. We humans on the other hand are really in for it if we don't start being more preservative.