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Today some of our main issues are Energy, Health and Economy. Lot of people has different great ideas to improve in each area.   Like using solar and wind for energy. Exercise more to drive down the health care cost and it helps building stronger and better economy.  Some innovative green ideas or inventions are given below 1. Hotel offers free meal to guests who are willing to generate electricity The Crown Plaza Hotel in Copenhagen, Denmark, is offering a free meal to any guest who is able to produce electricity for the hotel on an exercise bike attached to a generator. Guests will have to produce at least 10 watt hours of electricity - roughly 15 minutes of cycling for someone of average fitness. They will then be given meal vouchers worth $36 (26 euros).  2. Disco pub gets electricity produced by people dancing at specially modified dance floor All the flashing strobes and pounding speakers at the dance club are massive consumers of electrical power. So Bar Surya, in Londo