The Excel group is changing with the times. The agro-chemicals leader has taken a lead in the country to develop biopesticides and manage solid waste by converting it into organic compost. The company CMD, Ashwin C Shroff, spoke to FE on the sidelines of the recently concluded Ficci Environment Conclave to emphasise upon the need to have an integrated approach to sustainable waste management. Shroff is also chairman of the Ficci environment committee. Excerpts: How big is the environment technology market in India?