Brexit negotiations are set to resume as compromises over issues such as fishing rights are sought.
Three employees and a contractor were killed in the blast at a water recycling centre in Avonmouth.
Hundreds of residents reported hearing explosions in the early hours of Friday caused by the weather phenomenon.
The "ambitious" target would see the UK cutting emissions faster than any major economy so far, the PM says.
The cut comes at a time when the industry is suffering from low passenger numbers due to the pandemic.