"There's going to be conflict of interest when you see deep pockets and money flowing....from the very industries that are going to be benefiting," May said, speaking in Vancouver.
Andrew Weaver, a respected climate scientist and leader of British Columbia's Green party, hopes to have something in common with Rachel Notley, Justin Trudeau and even Donald Trump.
The campaign has been underway unofficially for weeks with the Liberals, NDP and Greens releasing platform details for an election that polls suggest will be a tight battle.
It won't be much of a summer vacation - the MP for Saanich-Gulf Islands is deciding whether to resign as party leader after members voted to support sanctions against Israel.
A new report shows British Columbia's carbon emissions are rising, but the government insists that accusations it has trailed on climate action are "false."