Carbon emission occurs during various stages of life cycle of food products. Greenhouse gases (GHG) emission from 24 Indian food items showed that animal food products (meat and milk) and rice cultivation mostly contributed to methane (CH4) emission, while food products from crops contributed to emission of nitrous oxide (N2O). Emission of CO2 occurred during farm operations, production of farm inputs, transport, processing and preparation of food.

In the present studies, attempts are made to optimize digestion time, initial feed pH, feed temperature and feed flow rate (organic loading rate, OLR) for maximum yield of methane gas and maximum removal of chemical oxygen demand and biological oxygen demand (BOD) of food processing industry wastewaters in three-phase fluidized bed bioreactor.

The UN sponsored discussions to prepare a global convention on climate began in February in USA. The aim is to prepare a legally binding convention to curb gaseous emissions leading to a much feared climate destabilisation. This convention is being seen as the world's greatest commitment to the environment and its future generations.