Honeysuckle is killing forests and ivy is helping, especially in the northeast/midwest. Kill all that shit, help stop it from spreading. And try to volunteer for local groups that are clearing invasive species. It's pretty amazing seeing a forest before and after invasive species have been removed.
Probably not, but if you’re body feels like it’s on fire because you see them popping up just do it.
There are probably plenty of volunteer programs through parks or NGOs wherever you live which is the most effective thing you can do.