South Africa is a developing country, ranking 114th on the Human Development Index. It has been classified by the World Bank as a newly industrialised country, with the second-largest economy in Africa, and the 35th-largest in the world. South Africa also has the most UNESCO World Heritage Sites in Africa. The country is an upper-middle power in international affairs; it maintains significant regional influence and is a member of both the Commonwealth of Nations and G20. However, crime, poverty and inequality remain widespread, with about a quarter of the population unemployed and living on less than US$1.25 a day. Moreover, climate change is an important issue for South Africa: it is a major contributor to climate change as the 14th largest emitter of greenhouse gases as of 2018 (in large part due to its coal industry), and is vulnerable to many of its impacts, because of its water-insecure environment and vulnerable communities.