Shibu has been active in movements and campaigns related to the environment and toxins since 1991. He entered the realm of environmental activism by organizing environmental education programs for schools in Kerala. He is one of the pioneers of the zero waste movement in India and led the zero waste campaigns and programs for Thanal – one of the oldest environmental organizations in South India. His expertise is in organics management, designing and developing zero-waste systems at the community level, and strategizing zero-waste programs and campaigns. He is currently Adviser to Organics and Climate campaigns in GAIA (Global Alliance for Incinerator Alternatives).