Mathers had previously made submissions to Parliament on bills, opposing clauses of the Resource Management (Simplifying and Streamlining) Amendment Bill 2009 and arguing for the "setting of minimum environmental standards" across the country.[13] She also wrote in opposition to the Climate Change Response (Moderated Emissions Trading) Amendment Bill 2009, arguing it "would substantially weaken the existing emissions trading scheme, reducing incentives to reduce emissions while providing large ongoing subsidies to climate polluters at enormous cost to the taxpayer".[14]