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Saving the diversity and abundance of life on the earth may cost $100 billion a year, say scientists who have proposed a policy to prevent another mass extinction event on the planet. There have been five mass extinctions in the history of the earth. Scientists now estimate that society must urgently come to grips this coming decade to stop the very first human-made biodiversity catastrophe. “The sixth extinction is on our society’s shoulders; it really is,” ecologist Mr Greg Asner, of Arizona State University in the U.S., said in a statement on the occasion of Earth day.