Finding the resources to meet this demand in a ___小题2:___, sustainable way is the basis of our nation's energy security, and will be one of the major ___小题3:___of the 21st century. Alternative forms of energy- bio-fuels, wind and solar are ___小题4:____ being funded and developed, and will play a growing___小题5:___ in the world's energy supply. But experts say that even when combined, alternative energy sources will likely meet only about 30% of the world's energy needs by 2050. For example, even with ___小题6:___ investments, such as the $93 million for wind energy development ___小题7:___ in the American Recovery and Reinvestment Act, important alternative energy sources such as wind and bio-fuels __小题8:___ only about 1% of the market today. Energy and sustainability experts say the answer to our future energy needs will likely come from a lot of ___小题9:___ both traditional and alternative. |