Read a June 24, 2009, blog post at the Web site of the Jesuit magazine America, “Obama going to the Vatican,” by Michael Sean Winters.

Read a June 29, 2009, report on the pope’s comments about the encyclical, “In preview of new encyclical, Benedict reprises ‘dictatorship of relativism’ speech,” by National Catholic Reporter columnist John L. Allen Jr.

Read a June 29, 2009, article at the First Things Web site, “Economic Heresies of the Left,” by Michael Novak. Novak is considered a conservative Catholic writer who defends capitalism in this essay and elsewhere against interpretations of papal teachings that some say criticize the capitalist system.

Read a July 1, 2009, Religion News Service article, “Groundbreaking economic encyclical on the way,” by Sister Mary Ann Walsh, spokesperson for the USCCB. It’s posted at the USCCB media blog site.

The media blog at the Web site of the United States Conference of Catholic bishops has a “Social Encyclical Primer” that sets out the history of papal encyclicals on social justice themes.

Christine Gutleben is director of the animals and religion program for the Humane Society of the United States. She has an undergraduate degree in religious studies and a master’s degree from a theology school, where she studied theology and ethical food choices.

Rabbi Harold S. White is Jewish chaplaincy director and senior Jewish chaplain at Georgetown University, where he also teaches in the theology department. He is deeply involved in animal protection issues.

Andrew Linzey is a lecturer in theology at the University of Oxford in Oxford, England . He has written widely on animals and Christianity, including a series of liturgies for animals.

Calvin DeWitt is a professor at the Nelson Institute for Environmental Studies at the University of Wisconsin-Madison. He is concerned with the ethics of farming and uses of the natural environment, including animals. He is co-founder of the International Evangelical Environmental Network.