Downer EDI's board has been asked to change its constitution to prevent it from taking on work that contributes to climate change by shareholders opposed to Adani's $16.5 billion Carmichael coalmine.

Galilee Blockade, an activist group that has been waging campaigns against Downer, has organised 150 retail shareholders to send a letter to Downer proposing a special resolution to be voted on at its annual general meeting on November 2.