There are five months remaining until COP21; however, there are less than 10 days of negotiations left until the Paris meeting -- only two more meetings of negotiators, one in August and one in October. This is not very much time at all to finalize the conditions of the framework and have all parties agree to implementation.
The White House and the U.S. Environmental Protection Agency released a new peer-reviewed report saying inaction on climate change is a dire threat to human health and the economy. It specifically estimates the physical monetary paybacks across 20 sectors of the U.S. by year 2100 if world leaders successfully limit global warming to 2 degrees Celsius above pre-industrial levels.
There is one very practical measure, immediately realizable and eminently feasible that is, as it were, staring the pope right in the face: The pope should not only end the Catholic Church's morally absurd and repugnant opposition to contraception, but should urge all families to engage in responsible family planning.