- WHO World Health Organization
- WHO World Meteorological Organization
- WRI World Resources Institute
- WWF World Wildlife Fund
The grouping of countries in the presentation of data is indicated in the appropriate places. The term "industrial countries" generally encompasses the UN categories of developed market economies and the socialist countries of Eastern Europe and the USSR. Unless otherwise indicated, the term "developing country" refers to the UN grouping of developing-country market economies and the socialist countries ot Asia. The term "Third World", unless the context implies otherwise, generally refers to the developing-country marks; economies as defined by the UN.
Unless indicated otherwise, tone are metric (1,000 kiloqrammes or 2 204.6 pounds). Dollars are current U.S. dollars or U.S. dollars for the year specified.