Joseph Bast is president and CEO of the Chicago-based Heartland Institute, which is skeptical of man-made climate change. Bast’s research focuses on public policy, environmentalism, climate change, health care and economic issues. He has been critical of Pope Francis’ climate change campaign.

Katharine Hayhoe is a professor of political science and co-director of the Climate Science Center at Texas Tech University. She is also the co-author of A Climate for Change: Global Warming Facts for Faith-Based Decisions. Hayhoe is an expert on Christian responses to global warming, and she works to reconcile science and faith in Christian communities.

Sohaib N. Sultan is Muslim life coordinator and chaplain at Princeton University. In July 2014, as part of a series of Ramadan reflections for Time, he wrote about why Muslims should avoid food waste.

Read a Jan. 2, 2014, story from National Catholic Reporter about how Catholic bishops, organizations and individuals around the country are voicing concerns over the natural gas industry practice known as fracking.

Sister Miriam Therese MacGillis is a Roman Catholic sister in the Dominican order who has been deeply involved in environmental work for decades. In 1980, she helped create Genesis Farm, an Earth literacy center in Blairstown, N.J., and she serves as its director. In 2007, the environmental magazine Grist named her one of the world’s top […]

Read an Oct. 16, 2013, article in The Atlantic about Roman Catholic nuns from a variety of orders who have become deeply involved in environmentalism.

Read the TreeHugger website’s Oct. 14, 2009, list of classic movies with “eco apocalyptic” themes.