气候变化会严重威胁人群健康，任何国家都无法避免气候变化对健康的影响。为了应对这一危机，伦敦大学学院和清华大学联合全球30余家学术机构于2016年共同成立了“柳叶刀倒计时：追踪人群健康与气候变化进展”项目，并合作撰写了《柳叶刀倒计时：人群健康与气候变化》重大报告，以追踪气候变化对人群健康的影响以及应对气候变化带来的人群健康效益，同时开展公众宣传、提出政策建议。2020年的报告在追踪了5大领域43个指标的年度变化后发现，气候变化影响、暴露和脆弱性相关的指标全部都在恶化，但各国为减缓气候变化所做的努力却明显不足，以现在的趋势很难达到《巴黎协定》设定的2℃温升控制目标。新冠肺炎疫情全球大流行和气候变化带来了相互叠加的危机，需要共同应对。多重危机的共同应对可以为全社会实现三赢：更好的公共卫生条件、可持续的经济发展以及对环境的保护和改善。

Climate change has posed a serious threat to human health. If greenhouse gas emissions and global temperatures are allowed to deteriorate, climate change can become one of the major threats to global health in this century. To cope with the crisis, University College London and Tsinghua University established "Lancet Countdown:Tracking Progress on Health and Climate Change" project jointly with more than 30 top academic institutions globally in 2016 and cooperated together to write the "Lancet Countdown:Health and Climate Change" reports, to track the impact of climate change on population health and the health benefits of tackling climate change and carry out public propagandization and policy recommendation. The latest 2020 global report, which tracked annual changes in 43 indicators across five areas, found that indicators of climate change impact, exposure and vulnerability were all deteriorating while efforts to mitigate climate change were clearly inadequate, and that it would be difficult to meet the temperature rise target set in the Paris Agreement according to current trends. The report drew three key conclusions:1) no country-whether rich or poor-is immune from the health impacts of climate change; 2) the COVID-19 pandemic and climate change represent converging crises which need to be tackled in unison. 3) A joint response to converging crises can deliver a triple win:better public health, a sustainable economy and environmental protection.