This idea is supported by economist Robert Solow who claimed that four-fifths of US economic growth could be attributed to technological development (the other fifth being accounted for by expansion of labor and capital).
[citation needed] Canada is the largest single source of oil imports for the United States.
[2] EIA's 2007 International Energy Outlook estimates that tar sand production will climb to 2,300,000 bbl/d (370,000 m3/d) in 2015 and 3.6 million barrels per day (570×10^3 m3/d) in 2030.
[citation needed] Environmental economists and critics of globalized capitalism take issue with this theory for a number of reasons.
Anti-globalists apply a similar argument, but tend to focus on exploitation of third world societies rather than the environment.