In the not-too-distant future -- with regard to history's timeline -- there will come a point when fossil fuels will have been depleted and humans will be forced to find alternative sources with which to power automobiles, household heating units and other machinery that utilizes fuel. However, waiting until supplies are exhausted before establishing a workable alternative would place a major hardship upon future energy demands. For this reason, various options -- not only those …showed first 75 words of 835 total…

…showed last 75 words of 835 total…