latimes.com
Climate extremes are becoming more extreme, worrying scientists
Much of the U.S. just sweltered through intense heat waves, putting strain on power grids and prompting the cancellation of many events. In Europe, punishing temperatures pushed thermometers as high as 111 degrees Fahrenheit in France, as wildfire tears through swaths of the country. A troubling pattern has emerged in this summer’s heat: Not only has it broken records, it’s done so often by margins far above the previous all-time highs. These heat jumps are part of a larger shift. Sea levels are rising and polar ice is melting faster than before, while new records for daily rainfall are being set at a rapid clip. The pace of global warming itself has quickened in recent years. Although scientists have long braced for climate change, the growing severity of its impacts is shocking them. Today’s climate can “seem like an unexpected step change” from that of a few years ago, said atmospheric scientist Katharine Hayhoe of Texas Tech University. Climate models from decades ago have proved prescient, closely aligning with what the mercury later showed: heat increasing around the planet, caused primarily by humans burning fossil fuels. As the global average temperature rises gradually, changes on the ground can be abrupt...