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Vaccination against SARS-CoV-2 lowers the risk of long COVID after infection by only about 15%, according to a study of more than 13 million people1. That’s the largest cohort that has yet been used to examine how much vaccines protect against the condition, but it is unlikely to end the uncertainty. Long COVID — illness that persists for weeks or months after infection with SARS-CoV-2 — has proved difficult to study, not least because the array of symptoms makes it hard to define. Even finding out how common it is has…

U.S. carbon dioxide emissions rose by 4 percent in the first quarter, as American drivers hit the road in record numbers during the first three months of the year. U.S. motorists logged 753 billion miles on the road through March, according to the Federal Reserve Bank of St. Louis. That's the highest first-quarter tally since the federal authorities began keeping track in 1970. The extra miles highlighted the continued recovery from the Covid-19 pandemic and came in the face of a run-up in gasoline and diesel prices. In…