Kill me now.The world leaders are simply unfit for the task of understanding and implementing science. What has to be done is radical and has to be understood in the context of the science and technology involved. Not only will the essential changes be highly unpopular - stop eating large quantities of meat, stop using aeroplanes for tourism and unnecessary commercial travel, convert your cars to electric, eat locally and in season and stop importing completely unnecessary stuff like kiwi fruits - but the world leaders are mostly too corrupt and too unscientific in their training. In many cases leaders are simply army generals or leaders of militia. Asking these guys to implement complex and unpopular changes is like asking a cat to read the Origin of Species. The public backlash will be absolutely huge - look at the fuss about wearing masks and closing restaurants. Multiply that by n where n is a very large number. Frankly it's not going to happen anytime soon, and beyond soon its too late.