Hope you can all help...

My neighbor has approx 10 trees growing either on or butting up
against our common property line. They're NOT small. I have no trees
on my property. I ahve to put up with maples and those horrible trees
that drop blackberries. ALso, since the "air space over my property is
clear, guess which way all of his trees grow? I have already
approached him once about cutting down his trees, but he says he likes
the shade. Odd since he's rarely in his back yard - there's no where
to go since it's completely overgrown!

Does anyone have any suggestions? I've already hired a tree cutting
service to take out all the branches overhanging my yard. And what if
a tree trunk curves over my property line and back into his? The mess
in my yard is really bad. Thanks!