Alcoa and South 32's Worsley Alumina mine bauxite in WA's South-West to produce alumina that is exported to aluminium refineries.
The industry is energy-intensive mining in the jarrah forest is facing significant opposition on environmental grounds.
WA's industrial greenhouse gas emissions are dominated by four products and a handful of companies, including a few that have managed to keep a low profile in the climate wars.
No deal with Alcoa has cost Adelaide Brighton 31% of its value and threatened its WA lime business that is warring with its neighbours in suburban Perth.
