Not just population growth, but the absolute population is now leveling off and/or declining in many developed countries. Some countries have tried to stave of

Not just population growth, but the absolute population is now leveling off and/or declining in many developed countries. Some countries have tried to stave off population decline with indiscriminate mass immigration, but that turns out not to be a long term solution. The Kaya identity is relevant: impact = population × affluence × technology. If population falls slowly, then it's likely that growth of affluence will more than compensate.