On Monday, 200 global investors managing more than $15 trillion (13.7 trillion euros) in assets, urged the G7 rich country group, which includes the USA, to "stand by their commitments to the Paris Agreement". But recent reports suggest that key administration officials, including Secretary of State Rex Tillerson, want the U.S.to stay the course in order to have a say on global climate policies.
President Donald Trump had previously said he would "cancel" the Paris deal or find a way to back away from targets set by the Obama administration.
Those concerns were amplified in a meeting of White House staff and administration lawyers on Monday, as officials also expressed skepticism about whether the US has the ability under the agreement to dial back its pledge to slash greenhouse gas emissions.
Mr Trump has since said he will make his decision on the deal before the next Group of Seven meeting from May 26 to 27 in Sicily.
To that end, Ivanka Trump will hold a separate meeting Tuesday with Environmental Protection Agency chief Scott Pruitt, the official said. This is extremely troubling because President Trump has claimed that global warming in a hoax and Administrator Pruitt questions the overwhelming scientific consensus that accelerated climate change is humankind's fault.
And the decision to participate in next week's United Nations climate talks should not be construed as a sign that Trump has chose to stay in the Paris pact, a State Department official added.
A State Department official said a USA delegation would travel to Germany, though it would be "much smaller" than in previous years, and would aim to ensure "that decisions are not taken. that would undermine the competitiveness of U.S. businesses, or hamper our broader objective of advancing U.S. economic growth and prosperity".
Under the Paris deal, brokered by former President Barack Obama and world leaders in 2015, nations agreed to non-binding pledges to cap or reduce emissions of heat-trapping greenhouse gases.
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Environment groups fear the accord will be undermined if the USA - the world's largest economy and second-largest carbon polluter - cans the deal. U.S. officials say the timeline is being driven by the Group of 7 summit, which Trump will attend late this month in Italy.
Mr Trump needs to announce a decision before that summit so that leaders can determine whether and how to address climate change issues during the G-7.
She was confident, though, that these challenges would not be "unsurmountable", noting that businesses, cities and individual USA states were firmly on track to a green energy future.
"As long-term institutional investors, we believe that the mitigation of climate change is essential for safeguarding our investments", according to the letter signed by 214 institutional investors and published on Monday, Reuters reported.
The Paris Agreement's Article 4 says any nation can adjust its goals at any time "with a view to enhancing its ambition".
The letter's signatories include major firms like HSBC Global Asset Management, as well as pension funds such as California Public Employees Retirement System and a host of faith-based groups. It does not mention an option of reducing ambition, and some U.S. legal experts argue that the wording makes it impossible for Mr Trump to stay in the agreement and carry out his promises to promote the high-emitting United States coal industry.
Mike McKenna, a Republican energy consultant pushing for an exit, argues there's just too much legal risk to stay in.