He led the protest against the methane gas project started by Great Eastern Energy Corporation proposed in the Cauvery delta region of Tamilnadu.

In 1963, he began working for the Agricultural Regional Research Station, a government organisation in Kovilpatti, as a scientist, conducting trials on spacing and manure levels of various chemical fertilizers in cotton and millet crops.

His focus was on improving the standard of living through agricultural development in the Kalakad block of Tirunelveli District, Tamil Nadu.

It was at this time that he realized that in order to get optimal results in farming, farmers should rely only minimally on external inputs.

He completely lost trust in conventional farming practices and began experimenting with sustainable agricultural methods.

In 1995 he was nominated as the Tamil Nadu state coordinator for ARISE (Agricultural Renewal in India for Sustainable Environment).

Recognizing his extensive work in the field of agriculture, the Gandhi Gram Rural University, Dindigal honored Nammazhvar with a Doctorate of Science degree in 2007.

G.Nammazhvar traveled widely across the world, observed the agricultural practices in various different ecological systems and based on his findings, trained several farmers and NGO workers.

G.Nammazhvar spent a substantial part of his time actively touring the south and conducting training classes on ecological farming.

[3] He led the Historic Protest against The Methane Gas project which was Started by Great Eastern Energy Corporation an American multinational.

Nammazhvar was the Chief Guest for the practical session conducted on organic farming titled "iniyellam iyarkai" (Now all natural) on 20–21 July 2013 by the Ramanathapuram district collector.