Dozens of evangelical Christian leaders, breaking ranks with the Bush administration as well as many of their peers, yesterday launched a new faith-based campaign against global warming. “(M)any of us have required considerable convincing before becoming persuaded that climate change is a real problem and that it ought to matter to us as Christians,” declares their official statement. “But now we have seen and heard enough” to convince them that climate change is real, it’s bad, and people of conscience should do something about it. It’s signed by 86 people, from Rick Warren, author of the bestseller “The Purpose-Driven Life,” to the new head of the Christian Coalition.