Since his election in 2013, Pope Francis has tackled many issues of urgent reform within the church. Mercy in Action explores Pope Francis's efforts to renewCatholic social teaching—the guidance the church offers on matters that pertain to social justice in the world. The book examines what Pope Francis has said, done, and written on six critical social issues today—economic inequality, worker justice, preserving the environment, healthy family life, the plight of refugees, and peacemaking. The book also highlights both continuity and change in Catholic social teaching. Author Thomas Massaro illustrates how on each social issue—from expressing solidarity with unemployed workers to writing an encyclical addressing environmental degradation and climate change—Pope Francis has worked to update the church's message of social justice and mercy.