President Donald Trump may have torpedoed the Paris climate accord as US diplomats brace for huge cuts to their environmental programs.

But on Monday, American officials joined world diplomats wading out into the Potomac estuary to replant seagrass in a telling gesture paired with an unlikely photo opportunity.

Embassy staff from 13 countries -- from great power China to tiny island nation Malta -- joined helpers from the State Department to restore a small corner of the waterway.

Their grass had germinated six months ago under a previous administration that had made environmental protection a foreign policy priority.

The shoots were nurtured in foreign embassies in Washington, then wrapped in damp newspaper for the hour-long road trip to Mason Neck State Park in Virginia.

Soggy headlines in several languages recalled the political and diplomatic chaos in Washington as the Trump administration beds in.

The heading on one editorial -- covering part of the grass that Costa Rica was to contribute to Belmont Bay's underwater ecosystem -- stood out: "Climate change hypocrites."

It was an unfortunate note at an otherwise quietly positive event to help a mighty waterway.

Once badly polluted, America's biggest estuary network is slowly recovering. Water snakes swam by and ospreys dove for fish as the volunteers waded in.

But even as the diplomats worked, a new batch of headlines was being written elsewhere.

In New York, UN chief Antonio Guterres urged countries to put aside national interests to focus on saving the oceans and prevent "global catastrophe."

In Beijing, the senior diplomat at the US embassy -- which is still waiting for its new ambassador to arrive -- resigned abruptly, reportedly over opposition to Trump's climate stance.

And a new poll, conducted for ABC News and The Washington Post, found that US voters oppose Trump's decision on the Paris pact by a margin of two to one.

Although China and Europe have vowed to increase their support for the 2015 Paris accord's plan to cut greenhouse emissions, the US boycott leaves a gap in leadership.

Several US climate-related programs would disappear under a proposed budget presented by Secretary of State Rex Tillerson, the former CEO of oil giant ExxonMobil.

- Malta summit -

The Bureau of Oceans and International and Scientific Affairs, which had several staff on hand for Monday's event, will not suffer that fate. Its budget is slated to be cut by only $1.7 million to around $13.3 million.

Another program dear to the previous secretary of state, John Kerry, will also continue: the annual Our Oceans summit promoting maritime conservation.

Kerry hosted the 2016 summit in Washington, and the European Union will host this year's conference in Malta, which holds the rotating presidency.

Malta's ambassador Clive Agius, who joined the volunteers to plant a batch of seagrass, confirmed Europe's concern at Trump's Paris decision.

"We cannot not feel a bit disappointed that we're not all pulling the same rope," he said on the muddy foreshore.

After Malta, Indonesia takes up the Our Oceans banner, and their team was also at the park.

US officials point out that T