HAMBURG, Germany — World powers lined up against U.S. President Donald Trump on climate change Saturday, reaffirming their support for international efforts to fight global warming.

The final statement of the Group of 20 summit in Hamburg, Germany, underlined that the other countries and the European Union supported the Paris climate agreement rejected by Trump. They called the deal to reduce greenhouse gases “irreversible” and vowed to implement it quickly and without exception.

The other countries, from European powers such as Germany to emerging ones such as China and energy producers such as Saudi Arabia, merely “took note” of the U.S. position, which was boxed off in a separate paragraph that the summit host, German Chancellor Angela Merkel, made clear applied only to the United States.

She said the U.S. position was “regrettable” but that the summit had achieved “good results in some areas,” and cited a hard-won agreement on trade that does include Trump and the United States.

On trade, difficult talks yielded the preservation of the G-20’s condemnation of protectionism, a statement that has been a hallmark of the group’s efforts to combat the global financial crisis and the aftereffects of the Great Recession.

The group added new elements, however: an acknowledgment that trade must be “reciprocal and mutually advantageous” and that countries could use “legitimate trade defense instruments” if they are being taken advantage of.

That echoes concerns raised by Trump, who was attending his first G-20. He has said trade must be fair as well as open and must benefit American companies and workers. He has focused on trade relationships where other countries run large surpluses with the U.S., meaning they sell more to U.S. consumers than they buy from American companies.

More broadly, concerns about trade and its impact on workers figured large in the 2016 U.S. presidential election and in Britain’s referendum vote to leave the European Union, a free-trade bloc.

Yet pro-trade officials from the European Union pointed out that the language in the G-20 statement contains no departure from the current global system of regulation, which already allows countries to take defensive measures within the rules of the World Trade Organization. Those can include import taxes that offset unfair practices such as government subsidies or below-cost pricing.

The EU demonstrated its willingness to move ahead with free trade despite Trump by announcing a trade agreement with Japan on the eve of the summit.

On climate, summit deputies hashed out a three-part fudge that everyone could sign. That meant a first section with a broad pledge to fight climate change in general; a separate paragraph carved out that acknowledged the U.S. did not support the Paris deal; and a third paragraph in which the other 19 members reaffirmed their support for the deal.

Advocates for efforts against global warming expressed relief that the other countries had remained unanimous in support of the Paris accords.

“The U.S. has obviously been clear about where it stands with the Paris Agreement, but it is heartening that 19 other countries reaffirmed their commitment to the agreement,” said Thoriq Ibrahim, minister of energy and environment for the Maldives and Chair of the Alliance of Small Island States, a group of countries vulnerable to the effects of global warming.