The "ambitious" target would see the UK cutting emissions faster than any major economy so far, the PM says.
Another person was hurt when a "very loud explosion" was heard from a silo at the site in Bristol.
The cut comes at a time when the industry is suffering from low passenger numbers due to the pandemic.
The Pfizer/BioNTech vaccines are being kept in a central hub ahead of distribution.
Joe White will also act as consul-general to San Francisco when he takes on the role later this year.