Here’s the briefest possible summary of Warren Buffett’s Time op-ed:
Population increase .8% per year, GDP growth 2% per year, result happiness.
Population increase 3% per year, GDP growth 2% per year, result misery.
Over the last 30 years U. S. population growth has been about 3% per year, driven mostly by immigration. Recently, it’s been lower. The only practical way we can keep population growth below 1% per year is to constrain immigration.