Exciting and far-reaching experiments in sustainable energy have been conducted for the last 100 years in many parts of the world. Many of the initiatives work in their respective regions because of the availability of raw products or intense political will, as seen in Germany's solar effort and France's nuclear policy. Others result from the need to be self-reliant, such as the Brazilian effort to produce ethanol with their plentiful sugarcane crop and the Danish efforts to harvest offshore wind. Many of these experiments have been carried out at a large scale with the goal of producing more than 10–30% of the regions' energy needs.