NEW: Pfizer-BioNTech says it has asked the FDA to authorize its Covid-19 vaccine in children ages 6 months to 4 years — the only group that remains ineligible for vaccination. trib.al/E0w0QbX

NEW: Moderna announces it has begun a clinical trial testing an omicron-specific Covid-19 vaccine booster. trib.al/nLsMxvz

JUST IN: FDA approves the first long-acting injectable medication for use as pre-exposure prevention against HIV. trib.al/Mkdh1hC

US had the second-steepest decline in life expectancy among high-income countries last year, according to a study of death data spanning several continents. The findings suggest the US did a relatively poor job protecting young people during the pandemic. trib.al/AMMLvSf

Hockey players will skate on frozen rainwater, the Zambonis are electric, and the cutlery is bamboo — Seattle’s new Climate Pledge Arena is hardly subtle with its message. trib.al/ib6MYI9

The Biden administration is taking steps to address the economic risks from climate change. trib.al/7fNIHO9

Pope Francis encourages young climate change activists to continue their efforts “for the good of humanity,” adding that their vision “is capable of challenging the adult world.” trib.al/DukeBqQ

BREAKING: FDA authorizes Pfizer Covid booster for emergency use in American ages 65 and over, as well as those at high risk of exposure to the coronavirus or severe illness, according to a senior administration official. trib.al/qXOApVw

WATCH LIVE: Hurricane Henri approaches the northeast U.S. trib.al/gnbSPim

BREAKING: Biden administration to recommend Covid booster shot eight months after second dose, two sources familiar with the discussions tell @NBCNews. trib.al/zysQKfJ