…needed for agriculture integrates several variables: the size of the population, its income and diet, and the yield of crops grown. Already, growth in human numbers is slowing — the…
…1975). Wood and hay, the prevalent energy sources at the start of the nineteenth century, are bulky and awkward to transport and store. Consider if every high-rise resident needed to…
…A son-in-law and a cheap lifetime assistant in his lab all for a few thousand rubles.” The next few cases were simple ones. A health care expert who needed subjects…
…also require complementary infrastructures. Railroads needed telegraphs, and paved roads needed oil delivery systems so that gasoline would be available to fill empty car tanks. Moreover, the new systems take…
…feed needed to make meat declined, and the hectares needed to grow the feed lessened as yields rose. Net, about 2% less US land each year made meat. Let me…
…prescribe and deliver precise inputs of fertilizer, pesticides, seed, and water exactly where they are needed. We had two revolutions in agriculture in the 20th century. First, the tractors of…
…Most of the databases needed to specify the model already exist, and a growing number of research findings are available. Indeed, pulling together the information needed to build the model…
…a period of decades, steam engines overtook water wheels. In America, steam needed one hundred years to supersede water. Though we recall the nineteenth century as the age of steam,…
…1992b. Environmental Equity: Reducing Risk for All Communities. Volume 2: Supporting Document. Document No. 230-R- 92-008A. Washington, DC. U.S. General Accounting Office. 1983. Siting of Hazardous Waste Landfills and Their Correlation with Racial…
…of decades, the removal of tropical forests has been estimated at 1 percent per year. Until overcome by better livelihoods, cheap land, cheaper fuels, superior alternative wood products in the…