Pope Francis on Monday urged environmental negotiators meeting in Paris to strike a deal to address climate change, warning that the world is "at the limits of suicide."<br />"I am not sure, but I can say to you 'now or never'," he told a group of reporters aboard the papal plane, en route home from Africa, according to Reuters .<br />The pope's comments come as nearly 150 world leaders and others descend on Paris for a United Nations-sponsored environmental summit.<br />Francis accused politicians of having "done little" to deal with the growing problem, according to the National Catholic Reporter .<br />He specifically cited problems associated with glacial melt in Greenland and rising sea levels in low-lying countries.
