Columbia subject headings:
Economic forecasting.
Environmental policy.
Food supply.
Natural resources.
Twentieth century--Forecasts.
Twenty-first century--Forecasts.
Harvard subject headings:
Economic forecasting.
Environmental policy.
Food supply
Global 2000 Study (U.S.)
Natural resources.
Twentieth century--Forecasts
Twenty-first century--Forecasts
Princeton subject headings:
Economic forecasting.
Environmental policy.
Food supply.
Global 2000 Study (U.S.)
Natural resources.
Twentieth century--Forecasts.
Twenty-first century--Forecasts.