Hopefully we can strive for both

Higher population doesn't automatically mean destruction of the world - sure it makes it harder for resources but that is a different challenge to find solutions to.

If it is a signficant factor then by all means we can increase sex education , see how abstinence works and make contraception readily available. But once the process begins for a developing child I think it is best to promote the goodness of carrying it it to full term. I accept that people won't but it is a best case scenario to strive for.

Unless you are saying there should be a systemic culling of the population or mandatory abortion? That's different all together