Reuters: President Barack Obama praised Pope Francis for issuing a papal document on Thursday calling for action on climate change and said he looked forward to discussing the issue when the two meet at the White House in September. In the document, known as an encyclical, Pope Francis called for a change in lifestyle in rich countries to save the planet from environmental ruin and gave his firm backing to scientists who say global warming is thanks largely to human activity. "I welcome His Holiness Pope...