2011
Speech on Climate Change: The challenge and opportunity for our world, delivered at Asian University for Women Symposium: Imagining Another Future for Asia: Ideas and Pathways for Change, held at Dhaka, Bangladesh on January 21-22, 2011.
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2008
K R Narayanan oration: why environment needs equity: learning from the environmentalism of the poor to build our common future
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2006
Presentation on 'How to Operationalise the agenda for Water Conservation' at the meeting of Parliamentary forum on water conservation and management organized by Cell on Parliamentary Forum on Water Conservation and Management, Lok Sabha Secretariat

2005
Talk on 'Water conservation' as part of Lecture series for Members of parliament, organised by Bureau of Parliamentary studies and Training, Lok Sabha Secretariat

2004
Lecture titled 'From Your Flush to the River: Delhi's responsibility for a clean Yamuna’ as part of the Agenda Delhi series of lectures organised by India Habitat Centre and Indian Express at the India Habitat Centre

Inaugural address at the state level media seminar on rainwater harvesting organised by Jalanidhi and Press club at, Thiruvananthapuram, India

Keynote lecture at the workshop on rainwater harvesting- How to make it a public movement organised by the National Botanical Research Institute, Lucknow, India

Lecture at the Global Conscience on Simultaneous responsibility to the environment and poverty? Organised by the Ecological Council, Copenhagen, Denmark

Lecture given as part of the Leaders in their field lecture series on ‘Urban life – a living hazard’ at the India Habitat Centre

2003
Speech given at the Symposium on the Johannesburg Challenge: Perspectives and Priorities, Berlin, Germany, organised by the German Council of Sustainable Development

Council of Scientific and Industrial Research Diamond Jubilee lecture at the National Botanical Research Institute, Lucknow, India

Keynote lecture at the International Conference on Public-Private Partnership organised by Swiss Coalition of Developing Organisations at Berne, Switzerland

Foundation Day lecture given at the Ladakh Ecological Development Group at Leh, Ladakh

Lecture on Human Health and Ecological Security organised by the Foundation for Ecological Security at the India International Centre, New Delhi

Lecture given at the 2nd International Symposium on ecological sanitation at Lubceck, Germany

2002
"My Agenda for Johannesburg", at the conference " Countdown for Johannesburg" organized by the Heinrich-Boll Foundation

Challenge of urbanization in India: lecture at symposium on Asia’s urban environment" Stockholm, Sweden

2000
The Global Dialogue on Natural Resources: The Sustainability Challenge lecture at EXPO 2000, Hanover, Germany.

Lecture given to members of the US-India Roundtable on the issue of "Health and Environment" New York, America.

1999
We all live downstream: Urban industrial growth and its impact on water systems; Plenary lecture, 9th Stockholm Water Symposium, Sweden

What possibilities there are for Green Politics in Asia and what is meant by Green Politics in the Asian context, Colombo, Sri Lanka.

Debate 21: The Debate on Instruments for Sustainable Development for the Climate Sector organised by WEED and GERMANWATCH, Germany.

1998
NGO workshop on Emission Trading and Entitlements: organised by CSE and co-sponsored by German NGO FORUM, Stadthalle, Bonn, Germany.

1997
Government’s Agenda or Ours? The NGO Agenda in the forthcoming period at the workshop, Beyond Rio, organised by World Economy, Ecology and Development, Germany.

Sustainable development from the perspective of the South at the ‘Way out of the Growth Trap" Congress organised by the Heinrich-Boll-Stiftung, Germany.

How to build bridges between trade, environment and development to improve the effectiveness of global environmental policies at the Implementation of Multilateral Environmental Agreements: Ways and Means workshop organised by Ministry of Housing, Spatial Planning and the Environment, The Netherlands.

Environmental Security, plenary talk at the 1997 Open Meeting of the Human Dimensions of Global Environmental Change Research Community, IIASA, Austria.

Multilateral Environmental Agreements and the World Trade Organisation at the Symposium on Trade, Environment and Sustainable Development, Organised by the World Trade Organisation, Switzerland.

1996
Publishing Environmental News: How do you support sustainable development, at the Workshop on Reporting for Sustainable Development in Asia Pacific organised by UNEP, Beijing, China.

Public Debate with Andrew Steer, Director, Environment Department, World Bank, on Global Environmental Concerns – At whose expense? Head to Head Debate organised by the Oxford Centre for the Environment, Ethics and Society, Oxford, UK.

1995
Public Debate with Wolfgang Sachs, Chairperson, Greenpeace, Germany on "Towards Global Governance", at the First Conference of Parties to the Framework Convention on Climate Change, Berlin, Germany.

1993
Public Debate with Hans Alders, Dutch Environment Minister organised by the Evert Vermeer Foundation of the Dutch Labour Party, The Hague.