No it isn’t. The single biggest way to reduce your impact on Earth is so unpalatable as to be literally unthinkable: don’t eat meat and dairy, avoid having children that have children that have children that all want to eat meat and dairy.
Avoid having children that take airplanes and eat almonds.
Avoid having children and your impact on the Earth rapidly zooms out to nothing.
That’s not the only reason or the main reason to avoid having children. But it’s as good a reason as any.
Nobody will mention it at the top of articles though. Children are a joy and a treasure and not having them would be a slight against human nature.