SCIENTISTS say the increase in the atmospheric concentration of methane -- a major greenhouse gas -- is fast levelling off (New Scientist, Vol 140, No 1991). Evidence of a halt in methane rise

Buses in the northern and western parts of the country may soon run on a mixture of diesel and natural gas

LARGESCALE use of CNG as an automotive fuel can give breathing space to people in the heavily-polluted metropolitan cities of India. Motor vehicles are said to be responsible for 60 per cent