Explanation:

World happiness report 2017 is released by United nation Sustainable development solution network.
The World Happiness Report is a landmark survey of the state of global happiness. The World Happiness Report 2017, which ranks 155 countries by their happiness levels, will be released today at the United Nations at an event celebrating International Day of Happiness. The report, the fifth one to come out since 2012, continues to gain global recognition as governments, organizations and civil society increasingly use happiness indicators to inform their policy-making decisions. In addition to the rankings, this year’s report includes an analysis of happiness in the workplace and a deeper look at China and Africa.