search for a substitute: To ascertain the viability of propane as an eco-friendly fuel, the SC directed the Central government on December 9, to launch a project for conducting tests for 50 two- and three-wheelers in Delhi ( Down To Earth , Vol 5, No15). The court asked the government and the Gas Authority of India Ltd to assist g&t Yoga Tech, a private company, to carry out experiments on the 50 two-stroke vehicles and submit the findings within four months. The court would then decide on the feasibility of propane as an alternative fuel. In another order, the court asked the Delhi government to fit its petrol driven cars with catalytic converters within two months.