In a startling break from its usual dry delivery of statistics and scientific reports, the World Meteorological Organization warned last night that climate change is causing the planet’s weather to rum amok and taking a significant human and economic toll. The organization found that erratic weather induced by global warming is no longer a prediction: It is a reality. Over the past year, the WMO, which is a part of the United Nations, documented record high and low temperatures and unusually severe weather events, ranging from unprecedented heat waves in India to floods in Sri Lanka to tornadoes in the U.S. The organization said its findings were consistent with computer-modeling predictions of the climate patterns that would be produced by global warming, and said to expect more erratic weather in the future.