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This web page has the following on the site, "In a sustainable future, solar energy, wind, running water, geothermal heat, and biomass will become the only viable energy sources." We saw that the web page also said " Energy will become a precious commodity that will have to be distributed to consumers with the highest efficiency, and used intelligently to provide maximum comfort and services from every energy unit harvested and delivered." It also said " The efficient use of energy and its conservation will become the cornerstones of this sustainable energy future. Just as it was in the 1920s, the 50s." The header had hydrogen fuel as the highest ranking optimized keyword. It is followed by spherical designs organization which isn't as ranked as highly as hydrogen fuel.