The graph above charts the contributions played by improved efficiency and adoption of renewable electricity sources as well as hydrogen fuel cells (with the hydrogen generated with renewable energy). (dotearth.blogs.nytimes.com)
With small - scale hydro and its even smaller variations, for all practical purposes you've got a clean, renewable electricity source from the start. (treehugger.com)
Renewable energy wind turbines as electricity sources possess extreme environmental problems. (howgreenisthis.org)