Falling global birth rates could be setting us up for disastrous consequences down the line. Dean Spears is founding executive director of r.i.c.e., a nonprofit that works to promote children’s health, growth, and survival in rural India. He joins host Krys Boyd to discuss a future with far fewer humans in just the next few decades and why stabilizing the diminishing population is such a monumentally difficult task. His book, written with co-author Michael Geruso, is “After the Spike: Population, Progress, and the Case for People.”