The COVID-19 pandemic and its aftermath marked the early 2020s. The first reports of the virus were published on 31 December 2019, though the first cases are said to have appeared nearly a month earlier. The pandemic led to a global economic recession, sustained rise in global inflation, and supply chain crisis. The World Health Organization declared the virus a global state of emergency. With multiple extreme weather events and ecological crises continuing to escalate, several world leaders have called the 2020s the "decisive decade" for climate action. The years 2023 and 2024 both broke yearly global temperature records, with 2024 breaching 1.5 °C above pre-industrial levels, which had been seen as a maximum threshold to prevent significantly negative human impacts on Earth's climate system. See more