By Adrian Morrow, Jane Taber, Sean Silcoff, The Globe and Mail.

Ontario Premier Kathleen Wynne is preparing to bring in a cap-and-trade system for greenhouse gas emissions, an ambitious move that could amount to the nation’s single largest salvo in the battle against global warming.

The new system would be linked with Quebec and California’s current cap-and-trade program, government and industry sources said, creating a carbon market of 61 million people and covering more than 60 per cent of Canada’s population.

Ontario Environment Minister Glen Murray is expected to present the plan to cabinet for approval within the next 10 days. It is believed to have widespread support among ministers already, one source said. The broad outlines of the system will be announced some time this spring – possibly around an interprovincial climate summit in Quebec City on April 13 – with full details worked out over the coming months.