What has happened since SERI/NREL first began operating 25 years ago? America uses nearly 50% more renewable energy than it did then. We are witnessing the emergence of markets based on new energy technologies. America is employing energy efficiency on a grander scale, decreasing its energy intensity (energy used per dollar of gross domestic product) by about 1% per year. 4 A researcher examines a beaker containing cellulase enzymes, a key element in producing ethanol from lignocellulosic biomass.
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