London — Britain should commit to a net zero greenhouse gas emissions target by 2050, government climate advisers say, which could require phasing out new petrol and diesel cars by at least 2035 and a 20% cut in beef and lamb consumption. Their recommendations came in a report released on Thursday after weeks of civil disobedience protests by climate group Extinction Rebellion, meant to raise pressure for action to tackle what it calls a global climate crisis. On Wednesday, Britain's parliament declared a symbolic climate change “emergency” in a nod to the increasingly vocal activist movement. Britain currently aims to cut greenhouse gas emissions (GHGs)  80% compared with 1990 levels by 2050. But campaigners say this does not go far enough to meet pledges made under the 2015 Paris climate agreement to try to limit a rise in global warming to 1.5°C. “The UK can end its contribution to global warming within 30 years by setting an ambitious new target to reduce its greenhouse gas emis...

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