According to UNEP's 9th \"Global Trends in Renewable Energy Investment 2015\", prepared by the Frankfurt School-UNEP Collaborating Centre for Climate & Sustainable Energy Finance and Bloomberg New Energy Finance, the United Nations Environment Programme (UNEP) and Bloomberg New Energy Finance — the past year brought a rebound of green energy investments worldwide with a surge of a solid 17% to $270 Billion. Brushing aside the challenge of sharply lower crude oil prices this sudden increase reveresed the investment dip of the past two years and was mainly driven by investments in solar and wind energy.