Another problem to tackle will be the lack of infrastructure to fuel and service hydrogen-powered vehicles. As we gobble up finite fossil fuels, scientists are searching for ways to exploit available resources in a sustainable manner. Replacing limited and polluting energy sources with clean, renewable, and cost-efficient sources is a respectable goal. Futher, with an almost unlimited amount of heat generated by the Earth's core, geothermal sources are available almost every minute of every day. Harnessing the inexhaustible energy of the sun is poised to be the way of the future, as evidenced by the increasing number of solar panels across the globe, most notably in Japan, Germany and certain enclaves in the Western U.S. Solar cells, also known as photovoltaics, convert sunlight into electricity.
Wind energy is the least expensive renewable energy technology, and it is abundant and infinite.
In 2000, wind turbines accounted for 13 percent of Danish electricity consumption. That number is expected to jump to 50 percent by 2030. Offshore wind parks are also in the works. Nonetheless, fossil fuels remain the established source of energy across the globe. Alternative sources require research and development which in turn require funding.