Many childfree people have cited environmentalism as one of their reasons for not having children. An Oregon study confirms this reasoning. A choice like not having children has 40 times the positive impact on the environment as actions like recycling.
My family tries to recycle, drive fairly gas efficient older cars, and reduce our emissions in other ways, but we often forget or aren’t perfect. I am glad that my choice to be childfree is also in line with my values, including environmentalism.