Nearly 200 countries agreed on Friday to a moratorium on projects to fight climate change by adding nutrients to the seas to spur growth of carbon-absorbing algae.

The surprise deal followed 12 days of haggling at the U.N.'s Convention on Biological Diversity conference where Australia, Brazil and China had opposed until the last minute, halting the controversial plans for "ocean fertilization".

Opponents argue the little-tested process has unknown risks which could threaten marine life, for instance by making the oceans more acidic. Those in favor say it could be a new weapon to fight global warming.

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German Environment Minister Sigmar Gabriel, hosting the talks, announced the accord on the final day of the conference at which some 5,000 delegates from 191 countries tried to agree on ways of protecting animal and plant life on earth.

"It's a very strange idea that technology can solve everything. It's very risky and shows what humans are ready to do. I'm glad we came to a de facto moratorium," he told reporters.

During the conference, delegates and environmentalists have consistently said that human activity and greenhouse gas emissions are causing the most serious spate of extinctions since the dinosaurs died out 65 million years ago.

Three species vanish every hour, they say.

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