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Climate threat to ecosystems a real concern

Back in 1992, 1,700 scientists from around the world issued a dire warning to humanity. They said humans had pushed the world's ecosystem to a breaking point that would bring about colossal climate change.

The warning noted that air and water pollution, the collapse of world fisheries, and the loss of productive soil would befall human life.

This year, on the 25th anniversary of that warning, more than 15,000 scientists from 184 countries have followed up assessing the latest response to environmental issues.

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