In 2015, the pope will issue a lengthy message on [climate change] to the world's 1.2 billion Catholics, give an address to the UN general assembly and call a summit of the world's main religions. The reason for such frenetic activity, says Bishop Marcelo Sorondo, chancellor of the Vatican's Pontifical Academy of Sciences, is the pope's wish to directly influence next year's crucial UN climate meeting in Paris. The idea is to convene a meeting with leaders of the main religions to make all people aware of the state of our climate and the tragedy of social exclusion. In March ... the pope will publish a rare encyclical on climate change and human ecology. Urging all Catholics to take action on moral and scientific grounds, the document will be sent to the world's 5,000 Catholic bishops and 400,000 priests, who will distribute it to parishioners. In recent months, the pope has argued for a radical new financial and economic system to avoid human inequality and ecological devastation. Francis's environmental radicalism is likely to attract resistance from Vatican conservatives and in rightwing church circles, particularly in the US. Francis will also be opposed by the powerful US evangelical movement, said Calvin Beisner, spokesman for the conservative Cornwall Alliance for the Stewardship of Creation, which has declared the US environmental movement to be un-biblical" and a false religion. "The pope should back off," he said.