Each year , the Cleantech Group , the World Wildlife Foundation , and the The Swedish Agency for Economic and Regional Growth ( or Tillväxtverket ) release their Global Cleantech Innovation Index , in which 40 countries are examined for their potential for entrepreneurial clean tech startups . The report takes a 10-year look down the line and ranks each country on a basis of 15 different indicators . While the top 10 haven ’ t changed since last year , the outlook certainly has .