North America
USA- Invited as a Keynote Speaker in the Plenary on "Future of Cities," at Sustainatopia-2015, held in Los Angeles, USA, May 26-30, 2015.
- Participated in the United Nations Conference on “Sustainable Energy for All (SE4ALL)” organized at UN Head Quarter, New York, USA, May 18-22, 2015.
- Invited to work as Environmental Fellow under the auspices of the United States-Asia Environmental Partnership (US-AEP) and The Asia Foundation (TAF) at the WORLD BANK, Washington DC, Oct.,1994 to Jan.,1995.
- Invited to present paper at the 5th International Conference on ECOMATERIALS sponsored by Ministry for Education, Culture, Sports, Science and Technology, Japan and organised by Society of Non-Traditional Technology Japan, Hawaii (USA), Oct., 2001.
- Invited to participate in the UNEP’s International Life Cycle Panel (ILCP) meeting and present a paper in SETAC’s 4th World Congress, November 14-19, Portland, USA, 2004.
- Invited to present research paper and participate in the International Symposium on Environment and Hazardous Wastes, organised by Alena Chemicals Canada, Toronto, June, 1991
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