By Alison Withers and Gloria Dickie (Reuters) – Climate change is driving dangerous heat waves across the Northern Hemisphere this week and will continue to deliver dangerous weather for decades to come, research shows. “It is a worldwide heat wave that we are now suffering. That puts the heat under our decisions,” said Christiana Figueres, a former U.N. climate agency chief. Here’s how climate change is pushing heat to new extremes. HOW IS …