Each Friday morning I drag my huge garbage bin to the edge of my driveway and when I return home later in the day miraculously it's gone. Gone where? Probably to a landfill that's not doing anyone any good. Enter Covanta (NYSE:CVA), a company that has the expertise to turn trash into much needed energy while eliminating a majority of the waste it began with. It's been a venture that has been profitable for both the environment and its investors.