Christian Science Monitor: Reaching a substantive global agreement in Copenhagen, Denmark, at the UN-sponsored climate-change conference this December on reducing greenhouse-gas emissions is a necessary step, but it is not sufficient. In order to avoid catastrophic tipping points, we need to effectively manage key Earth system processes, and we need to do it now. In the run-up to the climate negotiations in Copenhagen, it is easy to get the impression that as long as we reduce emissions of greenhouse gases we …