History will remember 2020 as the year when the covid-19 pandemic plunged the world into turmoil, leaving climate change-which had begun to capture greater global attention and concern-consigned to the backroom of global news. Yet, this emergency 1 2 is by far the biggest public health threat we face, 3 and since the start of the pandemic we have already moved a year closer to the 2030 deadline to halve global emissions of carbon dioxide, and the 2050 deadline to reach net zero emissions. 4
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