Weddingbee boards

This may sound really weird, but. i was in geography the other day and my professor mentioned how the recent trend of buying carbon offsets is actually very harmful. He didn't go into a ton of detail about it, but from what I know the companies that participate in this program plant trees native to one place in another place, which is causing issues. Does anyone know more about this!? I think it is really interesting, and I was thinking about purchasing some carbon offsets but he made it very clear that you ought to find another way to be environmentally friendly if that is what your trying to do.