How can i get my neighbors to be more environmentally conscious?

ok first off im not a tree hugger but my neighbor just takes things way too far. Between him and his wife, they have a truck, cadillac escalade, bmw, and last month he just bought a friggin lamborgini. they also each have there own motorcycle, and they have 4 snowmobiles (one for each of them and then there 2 kids) 2 atvs, a john deere gator, lawn mower (ok thats not bad but i thought id add it anyway) and a large boat and 2 jet skis,and a large generator which powers his entire 4500 square foot house. Additionaly, we were just talking, and he said he is considering buying a helicopter! (i guess he got his helo pilot license a while back) How do i make him care about the environment?