US climate change negotiators express optimism

Washington

AFTER more than two decades of trying but failing to forge a global pact to halt climate change, UN negotiators gathering in South America this week are expressing a new optimism that they may finally achieve the elusive deal.

Even with a deal to stop the current rate of greenhouse gas emissions, scientists warn, the world will become increasingly unpleasant. Without a deal, they say, the world could eventually become uninhabitable for humans.