Earth risks tipping into 'hothouse' state: study

The planet urgently needs to transition to a green economy because fossil fuel pollution risks pushing the Earth into a lasting and dangerous "hothouse" state, researchers warned on Monday. If polar ice continues to melt, forests are slashed and greenhouse gases rise to new highs -- as they currently do each year -- the Earth will pass a tipping point. - What is 'Hothouse Earth'?

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