Buddhism teachings are very suitable to bring about peace and harmony as the teachings are never prejudice or extreme. The UN secretary is spot on solutions to world issues with Buddhism. The world now is degenerate and becoming more and more selfish which in the long run will bring about disharmony as people become more self cherishing. I'm not sure how would other religions will react to what the UN secretary said but if it's peace and harmony, then why not. I guess using the basis of Buddhist teachings as the essence to overcome the world issues will be a good start.