We all want to lead a happy life. But in our quest for 'progress' we've been pursuing priorities that put our happiness at risk - not just for us as individuals, but for society as a whole. Our collective aim should be a society with the greatest possible human happiness and well being - with policies, institutions and social attitudes that help people to lead flourishing lives. Today is the first United Nations International Day of Happiness. Read Mark's suggestions for a happier world!