By the 1990s we had surpassed all of them while moving 42 billion tons of rock and soil per year. In the last century we lost an amount of topsoil it took 1,000 years to form. So hogs we are. An Environmental History of the Twentieth-Century World provides historical perspective. Those numbers are so big they lack personal relevance.
Energy efficiency is an important strategy to deal with energy demand.
Historically, except for war shortages, energy efficiency played no role in U.S. public policy until the 1970s. Fossil fuels were available in essentially unlimited quantities at very low costs. Americans have become more aware of the realities of energy production and consumption. Supplies of fuels are finite. Energy production and use have adverse effects upon our environment.