In his groundbreaking June encyclical, Pope Francis issued a call for robust individual action and a sweeping transformation of global economic and political systems to deal with the dual threats of climate change and environmental degradation. On Sept. 25, he will bring aspects of that message to the United Nations. Yale Environment 360 asked experts on the environment and religion what they would like the pope to say before the U.N. Some would like Pope Francis to speak out about issues he overlooked or dismissed, including the role of population growth in environmental problems and the vital part that the private sector must play in combating global warming.