"We are absolutely committed to climate action and the Paris agreement and we have been extremely vocal about this".
Prime Minister Justin Trudeau has declined to endorse an worldwide statement backing the Paris Agreement on climate change in order to "appease" U.S. President Donald Trump, reports German magazine Der Spiegel.
"The U.S.is now left as a footnote to climate action and that's very sad", said Canadian Environment Minister Catherine McKenna.
"He (Trudeau) suggested simply limiting the statement to energy issues, something that Trump would likely support as well", said the report.
The head of the U.S. Environmental Protection Agency, Scott Pruitt, only attended the first day of the meeting on Sunday, held as an early summer heatwave settled over Italy, before flying back to Washington.
"I would point you the prime minister's recent comments and statements regarding the Paris Agreement and climate change", wrote Ahmad.
In a statement on Monday, he defended the US position.
The U.S. refused to become a signatory to a G-7 statement on the environment which said all member countries were committed to reducing greenhouse gas emissions, or "any section on climate change and multilateral development banks", Politico reported.
The 2015 accord, backed by almost 200 countries, aims to limit global warming to 2 degrees or less by 2100, mainly through pledges to cut carbon dioxide and emissions.
Trump announced his decision earlier this month, prompting concern in numerous remaining 194 signatories of the historic agreement.
Ms. McKenna said she talked with the other G7 environment ministers about that deal, as well as measures being taken on clean growth, carbon markets, innovation and trade, financing for developing countries that are coping with the effects of climate change, resource efficiency and marine litter.
May told Trump at the time that the climate accord was a safety net for future generations.