(d) Anaerobic decomposition of organic material in rice fields produces methane (CH4). It escapes to the atmosphere primarily by diffusive transport through the rice plants during the growing season. The Intergovernmental Panel on Climate Change (∣PCC,1996) estimated the global emission rate of methane from paddy fields at 60 Tg\/year, with a range of 20 to 100 Tg\/year.