Amy Liu, vice president and director of Brookings Metro, says that more than ever, cities and metro areas matter for America's future. They are at the forefront of demographic change, innovation, competitiveness, adaptation to climate change, and more. Show notes and transcript:   Follow Brookings podcasts on Apple or Google podcasts, or on Spotify. Send feedback email to , and follow us and tweet us at  on Twitter. The Brookings Cafeteria is part of the .