The pledge refers to the Paris accord as the "irreversible" global tool to address climate change, but at the end of the two-day meeting - the first for the G-7 since the US pulled out of the agreement - the countries' environmental ministers issued a final communique. German magazine Der Spiegel on Saturday said Trudeau made his comments in a call with German Chancellor Angela Merkel, who will host a G20 summit in July.
Michael Gove has said President Trump was wrong to withdraw from the Paris climate accord and that he would try to persuade him to change his mind.
On Monday, the United States refused to sign onto a pledge at a G7 environment ministers' meeting calling the Paris climate accord the "irreversible" global tool to address climate change.
Canada says it is deeply disappointed by Trump's decision.
Trump said earlier this month he intends to withdraw the US from the agreement unless it can be renegotiated.
A two-day meeting of environment chiefs from the Group of Seven club of industrialised democracies ended with the USA again disassociating itself from a statement underlining the importance of implementing the 2015 Paris deal on curbing carbon emissions.
Germany and California have agreed to bolster their cooperation on tackling climate change, as worldwide criticism continues to mount over the United States government's decision to pull out of the Paris Agreement.
Trump's representative at the meeting, Scott Pruitt, the head of the Environment Protection Agency, was unrepentant, insisting United States action spoke louder than words.
He said the biggest contributors to environmental reforms tend to be some of those developed countries like Norway with small populations and yet, they have been at the forefront.
"Obviously U.S is a massive economy and its contribution would be very fundamental to the operation of environmental and climate reforms within developing countries like PNG", he stated. Rather, it says that the accord is "the global instrument for effectively and urgently tackling climate change and adapting to its effects".