Fishery production worldwide leveled off in the 1970s and has stayed flat.
FORBES: Magazine Article
Companies are turning to exploration to ensure future coffee supplies because production has leveled off even as demand has increased, causing coffee-bean prices to quadruple since 2001.
WSJ: The Indiana Jones of Coffee
Mexican production declined a substantial amount last year, and may have leveled off for now, but could certainly resume declining.
FORBES: Growing World Automobile Population Threatens Petroleum Balance
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