Vista shares have fallen as much as 23.5% since Aug 17.
Methanex said efficiency improvements would provide an economic payback within two years with the potential to reduce the site’s carbon emissions by over 50,000 tonnes per annum.
Rather than a ban, National wants a gold-standard programme that would set world-leading compliance standards.
The Christchurch mayoral candidate wants the council to act to help stabilise its troubled holding company.