 Complete the following phrase:  The Bonn Challenge is a global effort to restore 150 million hectares of the worlds degraded and deforested lands by 2020 and 350 million hectares by 2030. It was hosted and launched by Germany and the International Union for Conservation of Nature IUCN in Bonn on 2 September 2011, in collaboration with the Global Partnership on ForestLandscape Restoration and targets delivery on the Rio Conventions and other outcomes of the 1992 