We passed the 1.5C climate threshhold. We must now explore extreme options | Sir David King

We do not have the luxury of rejecting solutions before we have thoroughly investigated their risks, trade-offs and feasibilityAs a lifelong scientist, I have always believed that if something is possible, we can find a way to achieve it. And yet, one of the starkest realities we now face is that the world is failing to meet its climate goals. Last year marked a historic and deeply troubling threshold: for the first time, global temperatures exceeded 1.5C above pre-industrial levels. Without dra