Host Japan on Saturday hailed a UN treaty aimed at protecting the world's threatened ecosystems, vowing to help "positively" member countries achieve the stated goals.

After nearly two weeks of intense diplomacy at a summit in the central Japanese city of Nagoya, rich and poor countries agreed Saturday to 20 key targets over the next decade on curbing the destruction of nature.

"As the chair, our country welcomes the achievement," Foreign Minister Seiji Maehara said in a statement.

"From now on, our country will contribute to the protection of biodiversity and positively support developing countries' efforts to implement the Nagoya protocol, with technologies and knowledge our country has," he said.

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