China is taking care of that by their one child policy. Indian govt is heavily invested in "family planning". Where as the rest of world included the "first world country" that "you are lucky to be born in" are pro-lifers. We need to stop poping out kids like there is no tomorrow. The whole world should practice one or two kids per family.
Biggest culprits are the religious zealots who want to see their creed multiply, every conservative or backward thinking group of people think that its in their best interest to grow their community. Economically also its said that we need to keep growing in numbers to keep a financially growing.
Its all wrong, we need to stop growing and keep shrinking, the earth cannot sustain these many people, we are already see water shortage and land shortage. We need to stop growing.