His first non-fiction book titled Heavy Metal: How a Global Corporation Poisoned Kodaikanal was published by Pan Macmillan in 2023.
[5] He led the public affairs groups and ex-workers to force the company collect 290 tonnes of mercury waste disposed in and around the factory site and send back to the United States for permanent retirement in 2003.
[6][7] Shahul along with campaigner Navroz Mody led environmental and local community groups in lobbying for remediation of the site,[8] and initiated an investigation by the Department of Atomic Energy of Government of India, which found that the mercury levels in the atmosphere of Kodaikanal was up to 2640 times more than normal conditions.
[9][10][11] Shahul also led a team of activists and volunteers to spook the annual general body meeting of Hindustan Unilever in Mumbai in 2003 and 2004.
[15][16] He also brought to notice the worst incident of a state owned company continuing to manufacturing the globally banned DDT.