Maher on Friday spoke on behalf of global unions with 169 million members from 153 nations when he addressed the UN Climate Change Conference on Friday.
He said the Bali road map must include the interests of workers alongside business as they adapt to the challenges of climate change.
"That's why Australian coal miners are calling on all coal companies to invest at least $1 per tonne of coal sold into new technologies. The big multinationals like BHP Billiton, Rio Tinto and Xstrata should be investing far more," Maher said.
The Construction, Forestry, Mining and Energy Union has been outspoken about climate change and the importance of cutting greenhouse gas emissions, especially by developed nations.
"Trade unions and working families are the biggest stakeholder group in climate change negotiations," Maher said.
"Unions have the capacity to assist climate change solutions, but must be recognised, engaged and consulted."