He has opened the dialogue…..
Check it out:

Cardinal Donald Wuerl said on Sunday that Pope Francis’ recently-released thoughts on global warming are intended to open the dialogue on the issue, not to be a definitive statement, and that GOP presidential candidate Jeb Bush’s skeptical response was “legitimate.”

Bush, a devout Catholic and former GOP Florida governor, praised the pope after he released his encyclical, or letter to all Roman Catholic Church bishops, on Thursday on global warming and its environmental impact.

“But I don’t get economic policy from my bishops or my cardinals or from my pope,” Bush said.