Elon Musk, the founder of PayPal and chairman of electric car company Tesla believes that Solar Power is the future of motoring world. According to him most of the world's power would come from solar by 2040. At the Future in Review Conference, Musk said that in 30 years, solar thermal and solar photovoltaic power will, combined, produce more electricity than any other source. At the present moment held the title is held by coal. Dislodging the coal industry with renewables would require massive capital investments and innovations, particularly in power storage. However before we go too far some basics need to be covered, Solar needs to get cheaper, and photovoltaics have to stop relying on raw materials (indium / monosilicon) that are difficult to acquire. Moreover, how do we store the power so we can use it at night, remains an elusive answer.
Elon Musk also believes "There should be a carbon tax."
Source
http://www.newlaunches.com/archives/paypal_founder_believes_in_solar_power.php