HALIFAX — Canada's environment minister said she's no "quitter" despite calls Wednesday from David Suzuki for her to resign and a G7 meeting that didn't shift her American counterpart's firm opposition to the Paris climate agreement.

Catherine McKenna had started off the three-day Halifax gathering by telling a personal story of encountering young people in the Arctic who are worried local hunters are falling through the ice due to rising temperatures.

"They're worried about whether we're going to do anything about it, because they don't feel empowered to do anything about it," she told the delegates, after reminding them of a summer that has seen massive forest fires and deadly hurricanes.

The minister also spoke of translating the targets of the Paris climate agreement into action and said countries need to firm up rules around how the carbon emission targets will be enforceable.

But by day's end, she'd faced calls from Canada's most prominent environmentalist to leave her job due to the prime minister's support of the fossil fuel industry.

The French environment minister recently took that route, saying he didn't want to create the illusion his presence in the government was leading to progress on climate change.

In a story published by La Presse, David Suzuki says if McKenna really believes what she's saying, she too should quit "instead of being an apologist for the government."

Suzuki: 'She must stop rationalizing what Canada is doing'

He told the Montreal-based news site that Canada lacks credibility on climate change, with the Liberal government supporting the construction of a pipeline to the British Columbia coast to transport Alberta bitumen.

Suzuki made the comments in the context of an interview about the resignation of French environment minister, Nicolas Hulot.

"She must stop rationalizing what Canada is doing," Suzuki told La Presse, adding that the government "talks out both sides of its mouth."

"We have a prime minister who signed (the Paris climate accord), who says, 'We're back,' and we all praised him ... then he approves pipelines! What is that?"

McKenna defended herself in an evening news conference, arguing it's easy to be divisive but difficult to continue battling for progress on climate change in a country dependent on resource industries.

"I'm not a quitter. Resigning is easy. It's really hard to do what we're doing. This is a long-term transition to a cleaner future."

"I'm going to stay in this job as long as the prime minister keeps me here."

Meanwhile, the head of the U.S. Environmental Protection Agency, Andrew Wheeler, said little in public during the meeting.

After the gathering, he said in an interview with The Canadian Press that the administration of President Donald Trump continues to be opposed to the Paris agreement.

"The Paris accord we didn't think was fair to the United States, but we are taking a serious look at our carbon emissions," he said.