Or non-wealthy Americans interested in winding down Federal over-reach. Really, in a federal republic aren't there quite a lot of things which can safely be left to the several states? Is it necessary to make everything an item for federal concern?
I completely agree! Most of them are already explicitly listed as federal concerns, in the Constitution; we should amend it to include environmental concerns for the exact reason you note.
But I see no reason why e.g. education should be a federal concern. Let the states do as they will.
Well, you hope so, otherwise a federal republic is a good idea. OTOH, simply because you have a federal government (or even that it was a good idea a century or two ago) doesn't mean that a federal republic is a good idea, and even if a federal republic is a good idea and there are quite a lot of things that make most sense at the state level, well, that doesn't mean that every particular thing belongs there.