In regard to the Jan. 26 commentary in the Christian Science Monitor, "Can Obama’s family-planning policies help the economy?": Bravo to the Monitor for covering the crucial population issue. The fact is that we can’t have our cake and eat it, too. The Earth can’t withstand unlimited population growth. China is a case in point. If its population size were "only" 130 million people, or 1/10th of its actual current population of 1.3 billion people, we could afford to be far less worried about the stunning increase in China’s per capita emissions of greenhouse gases. If other developing countries hope to follow China’s example in rapid economic development, limiting the growth of their populations now will pay huge dividends in reduced environmental impacts in the future.