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It is now a year since the UN set its new Sustainable Development Goals to try to make the world a better place. They include 17 goals and a massive 169 targets on subjects like disease, education and governance. But some people like Bjorn Lomborg are saying that there are just too many and they are too broad, and left like that will never achieve anything. Is he right? Is there a better way to make the world better and stop some countries lagging behind? Wesley Stephenson and Charlotte McDonald find out. (Photo: A teacher writes on a blackboard during a class in Kenya. Credit: Getty Images)