Höhne said there was a great deal of uncertainty over the effect Trump's policies would actually have on emissions.
Under the Trump administration - which has already canceled the implementation of Obama's climate action plan, rolled back a number of environmental regulations and placed a hold on the ongoing lawsuit surrounding the Clean Power Plan - the assessment suggests USA emissions will likely stop declining altogether and flatline instead.
The cuts in energy demand in China and India are significant because their economies are growing at 7 percent annually; much faster than the world average of 2.7 percent, according to the World Bank.
"There are 1.8 billion young people in the world today, more than ever before in human history, and about nine out of 10 live in developing countries". And that's just for the US economy alone. The trip, which begins tomorrow, includes visits to the Middle East, the Vatican and Brussels, and meetings of North Atlantic Treaty Organisation and the G-7 major developed countries. Astonishingly, the study projects China may have already met its Paris Agreement goal of peaking its Carbon dioxide emissions by 2030.
The Paris Agreement is a treaty, which, under global law, President Obama had the power to enter into, subject to ratification of the treaty by the Senate. China and the European Union, among others, have already reaffirmed their commitments in light of Trump's comments.
The U.S. will fall far short of its Paris climate goals, thanks to the environmental policy rollbacks carried out under the Trump administration, a new analysis suggests.More news: Fiat Chrysler shares drop on U.S. diesel emissions probe
What is that damage? "And we need to be part of that solution in making it happen".
India has also been seeing a steady decline in emissions production over the past few years. Experts on both sides agree leaving the global consensus on climate change would harm the country's reputation. Now, he has to finish the job and pull the Paris weed out by its roots by withdrawing the United States from the FCCC.
If Trump accepts this argument, Foreign Policy noted, it will "almost certainly" prompt him to "exit from the deal".
UNFCCC supporters have speculated that the inclusion of a new phrase added to the agreements in 2014 - that countries' responsibilities will be decided "in light of different national circumstances" - will impose tougher requirements on poor nations as they develop. "There's so much fluidity in worldwide politics" that the diplomatic hit would be temporary, said Pat Michaels of the libertarian-leaning Cato Institute.
Diplomats from more than 190 nations gathered in Bonn are due Thursday to conclude two weeks of discussions putting finer details on measures agreed in Paris in 2015 to curb the pollution behind global warming. On Saturday, he had the unenviable task of answering questions from other countries about USA climate and energy policy.
Meanwhile, the on-going tensions within the U.S. over the future direction of its climate and energy strategy were further underlined this week, as states and business groups criticised reported White House plans to slash the budget for the Energy Efficiency and Renewable Energy Office by 70 per cent and undertake a review of the USA energy grid that experts fear will be used to justify the curtailment of renewable energy development. Chinese negotiator Su Wei made this clear when he explained his government's position that the goal of the Paris Agreement is to "reinforce and enhance" the FCCC, not rewrite it. Second, he would aggregate emission reduction commitments from states, cities and corporations to give substance to the US role in the accord. Unfortunately, under the terms of the agreement, Trump can't give such notice until the agreement has been in place for three years, which means the earliest withdrawal date is October 5, 2019. It is the 1992 United Nations climate treaty signed by President George H.W. Bush at the Earth Summit in Rio de Janeiro and later was ratified by the U.S. Senate.