Global Daily CO$_2$ emissions for the year 2020
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Global Daily CO$_2$ emissions for the year 2020

  • Author(s): Liu, Zhu;
  • Deng, Zhu;
  • Ciais, Philippe;
  • Tan, Jianguang;
  • Zhu, Biqing;
  • Davis, Steven J;
  • Andrew, Robbie;
  • Boucher, Olivier;
  • Arous, Simon Ben;
  • Canadel, Pep;
  • Dou, Xinyu;
  • Friedlingstein, Pierre;
  • Gentine, Pierre;
  • Guo, Rui;
  • Hong, Chaopeng;
  • Jackson, Robert B;
  • Kammen, Daniel M;
  • Ke, Piyu;
  • Quere, Corinne Le;
  • Monica, Crippa;
  • Janssens-Maenhout, Greet;
  • Peters, Glen;
  • Tanaka, Katsumasa;
  • Wang, Yilong;
  • Zheng, Bo;
  • Zhong, Haiwang;
  • Sun, Taochun;
  • Schellnhuber, Hans Joachim
  • et al.

The diurnal cycle CO$_2$ emissions from fossil fuel combustion and cement production reflect seasonality, weather conditions, working days, and more recently the impact of the COVID-19 pandemic. Here, for the first time we provide a daily CO$_2$ emission dataset for the whole year of 2020 calculated from inventory and near-real-time activity data (called Carbon Monitor project: It was previously suggested from preliminary estimates that did not cover the entire year of 2020 that the pandemics may have caused more than 8% annual decline of global CO$_2$ emissions. Here we show from detailed estimates of the full year data that the global reduction was only 5.4% (-1,901 MtCO$_2$, ). This decrease is 5 times larger than the annual emission drop at the peak of the 2008 Global Financial Crisis. However, global CO$_2$ emissions gradually recovered towards 2019 levels from late April with global partial re-opening. More importantly, global CO$_2$ emissions even increased slightly by +0.9% in December 2020 compared with 2019, indicating the trends of rebound of global emissions. Later waves of COVID-19 infections in late 2020 and corresponding lockdowns have caused further CO$_2$ emissions reductions particularly in western countries, but to a much smaller extent than the declines in the first wave. That even substantial world-wide lockdowns of activity led to a one-time decline in global CO$_2$ emissions of only 5.4% in one year highlights the significant challenges for climate change mitigation that we face in the post-COVID era. These declines are significant, but will be quickly overtaken with new emissions unless the COVID-19 crisis is utilized as a break-point with our fossil-fuel trajectory, notably through policies that make the COVID-19 recovery an opportunity to green national energy and development plans.

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