If we're going to be friends of the earth, we need to recognize what steps we can take that will actually help, as opposed to those which only help us feel good about ourselves. As Wiccans, we crave and demand the right to make our own choices and choose our own path in life. We expect that anyone who tries to stop us from pursuing our chosen courses would do so only on account of a very good reason. If we are going to demand this freedom for ourselves, it behooves us to grant it to others. But it's more than just good PR to grant these freedoms to others.
Free people solve problems.
They pursue wealth, and ultimately, they achieve it. Rich people have smaller families. Furthermore, in a rich society, children cost more. In the US, a child may spend decades in school, being prepared for life in that culture. Furthermore, rich people generally get that way by solving problems.