Washington Post deputy climate & environment editor Juliet Eilperin and senior writer Frances Stead Sellers speak with Ayana Elizabeth Johnson, co-founder of Urban Ocean Lab, Katharine Hayhoe, chief scientist at the The Nature Conservancy, Mary Robinson, former president of Ireland, and Ayisha Siddiqa, climate justice activist & youth climate adviser to the U.N. Secretary General, in a series of conversations about innovative solutions to tackle a warming planet.