John Kerry, President-elect Joe Biden's climate envoy, joins Christiane Amanpour to discuss investing in new infrastructure. Then, climate activist Greta Thunberg breaks down why she thinks environmental and social justice go hand-in-hand. Cardinal Wilton Gregory speaks to Amanpour about his recent appointment by Pope Francis as the first African-American Cardinal. Atlantic Staff Writer Alexis Madrigal tells Hari Sreenivasan about The COVID Tracking Project.To learn more about how CNN protects listener privacy, visit cnn.com/privacyLearn more about your ad choices. Visit podcastchoices.com/adchoices