Ted O’Brien and Michaelia Cash also spoke in favour of ditching target at party room meeting. Follow today’s news live • Get our breaking news email, free app or daily news podcast

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Removing CO2 from atmosphere vital to avoid catastrophic tipping points, leading scientist says

Removing carbon from the atmosphere will be necessary to avoid catastrophic tipping points, one of the world’s leading scientists has warned, as even in the best-case scenario the world will heat by about 1.7C.

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