During periods with low energy demand, we can store the hydrogen. (treehugger.com)
Increasing mitochondrial density means that you'll be improving the quality of your reactors, which will translate into more efficient functioning at the expense of lower energy demands. (siimland.com)
With the exception of 2009, when the Great Recession resulted in lower energy demand for all fuels, natural gas use has been steadily rising since 1970, according to the report. (scientificamerican.com)