Also, increasing the population is one of the most damaging things to the environment, so there's an argument that not having kids is paying it forward to future generations also.
If you care about the short term, then yes.
If you care about humanity leaving the solar system before the heat death (or asteroid, whatever), then no.
No, that's paying it forward for the children of those that choose not to think as conscientiously as yourself on the matter of taking care of the environment. That's not the world I want to live in.
We know the culprit is excess consumption of fossil fuels among other resources, and we know if people have the option of consuming them, they will. Therefore, you can generalize it to mean reducing the population of people who may be in a position to consume at levels similar to the personal car, single family home with a yard family, driving 15,000 miles per year would help the planet.