More than half of worldwide vaccine doses have been administered in just four countries — India, China, the U.K. and the U.S. That kind of inequity will "extend the pandemic, globally," says Tom Bollyky, director of the Global Health program at the Council on Foreign Relations.NPR's Tamara Keith reports on the growing pressure for the Biden administration to step up its vaccine diplomacy. NPR's Lauren Frayer tours the largest vaccine factory in the world's top vaccine producing-country, India — a country poised for an even bigger role in global vaccine distribution. You can see photos and more from her report on the Serum Institute of India here.Additional reporting in this episode from NPR's Jason Beaubien. In participating regions, you'll also hear from local journalists about what's happening in your community.Email us at considerthis@npr.org.