By Olivia Le Poidevin and Emma Farge

GENEVA (Reuters) -The collapse on Friday of a sixth round of U.N. talks aimed at curbing plastic output has dimmed hopes of tackling a key source of pollution and left many advocates of restrictions pessimistic about a global deal during the Trump administration.

A three-year global push to reach a legally-binding treaty to curb plastic pollution choking the oceans and harming human health now appears adrift, participants said.

Many states and campaigners blamed the failure on oil-producers including the United States, which they said hardened long-held positions and urged others to reject caps on new plastic production that would have curbed output of polymers.

Debbra Cisneros, a negotiator for Panama, which supported a strong deal, told Reuters, the United States, the world's number two plastics producer behind China, was less open than in previous rounds conducted under Joe Biden's administration.

"This time they were just not wanting anything. So it was hard, because we always had them against us in each of the important provisions," she said at the end of the 11-day talks.

Anti-plastic campaigners saw little hope for a change in Washington's position under President Donald Trump,........

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