In recent years, global warming caused by increasing greenhouse gases has led to international problems. In this study we analyzed documents and articles such as a report on clean energy plan, inter-industry relation table, statistics on energy and economy, comprehensive energy statistics, investigative report on agriculture production cost and so on, and estimated energy consumption and its resultant CO
2 emission in agriculture. The results of this study are summarized as follows: (1) The total Japan's energy consumption in agriculture and forestry in 1991 was 7 x 10
6 t and the resultant CO
2 emission was estimated at 22 x 10
6 t. (2) The consumption of petrochemical products and electoricity was 7.894 x 10
6 KL and 386,870,000 kWh, respectively. Resultant CO
2 emission was found to be 23.3 x 10
6 t. (3) The CO
2 emission by the production of agricultural materials such as fertilizer, agricultural chemicals and films was estimated to be 4 x 10
6 t. (4) The study revealed that 7,228 kg of CO
2 per 10a was dischaged from such facilities as greenhouses and hothouses to control their air temperature. (5) CO
2 emission (kg/10a) by agricultural machine operation was 70 for rice, 30 for wheat, 42 for rye, 36 for barley, 75-101 for soy bean, 39-49 for rape, respectively.
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