Agricultural ecology 2 Agricultural intensification Rural development 2 Agricultural Economics 1 Agricultural development 1 Developing countries 1 Economic development 1 Environmental protection 1 Food production 1 Green revolution 1 Income and Poverty 1 Intensification 1 Natural Resource Economics, (New March 2000) 1 Policy and Planning 1 Pollution and Degradation 1 Supply, Demand and Prices 1 Sustainability 1