Two things:
1. Address the environmental concerns. Animal migration being a big thing that a wall would disrupt. But that can be solved.
2. Put solar panels along the entire length of the wall. It's a good idea anyway, since it could power surveillance cameras, crossing guard stations, and other things, and might even help out nearby towns. Yes, yes, have the batteries or whatever, too, to have juice at night. Alternatively (or in addition) perhaps integrate the occasional wind turbine.
It's not that lefties would like the wall any more, but they'd probably be willing to make that compromise.
1. Address the environmental concerns. Animal migration being a big thing that a wall would disrupt. But that can be solved.
2. Put solar panels along the entire length of the wall. It's a good idea anyway, since it could power surveillance cameras, crossing guard stations, and other things, and might even help out nearby towns. Yes, yes, have the batteries or whatever, too, to have juice at night. Alternatively (or in addition) perhaps integrate the occasional wind turbine.
It's not that lefties would like the wall any more, but they'd probably be willing to make that compromise.