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1. Between 1920 and 2000, labor requirements in the industry decreased by a factor of 1, 000, from more than 3 man-hours per metric ton to just 0.003.
2. To achieve dematerialization, Factor 10 proposes that within the next generation, human energy use must decrease by a factor of 10, and resource productivity and efficiency must increase by a factor of 10.
3. In 1999, Johnston et al . concluded that Sgr dSph has orbited the Milky Way for at least one Gya and that during that time its mass has decreased by a factor of two or three.
4. While estimates of the redshifts of HDF galaxies are somewhat crude, astronomers believe that star formation was occurring at its maximum rate 8 10 billion years ago, and has decreased by a factor of about 10 since then.
5. As a result of these innovations, between 1920 and 2000 labor requirements in the steel industry decreased by a factor of 1, 000, from more than 3 worker-hours per tonne to just 0.003.