Exnora International is a non-governmental environmental service organization started in 1989 in Chennai, Tamil Nadu, India, by M. B. Nirmal, a social activist. It focuses on preserving nature and preventing environmental degradation.
The name Exnora is derived from excellent, novel and radical ideas in Solving Environmental Problems by involving those who caused the problem. It is an example of a people, public, private (PPP) partnership. The organization's Environmental Training Institute conducts training programmes for school teachers on environmental issues such as biodiversity, climate change, and solid, liquid and zero waste management. The teachers are taught how to turn a home into a green building and set up vertical gardens.

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