The daily levels of carbon dioxide emissions in the world have reduced by 17% during the COVID-19 pandemic. An international team of scientists said the annual estimate of carbon dioxide emissions is estimated to end up between 4% and 7% lower than 2019 levels. This is the biggest annual drop in such emissions since World War II. Nearly half of the emission reductions came from less transportation pollution. If the next year returns to 2019 pollution levels, this temporary reduction will only be “a drop in the ocean.”