When is Earth Hour 2024 and how can you get involved?
UK landmarks switch lights off to mark Earth Hour
UK landmarks to switch off lights for Earth Hour
City skylines across the world plunge into darkness for Earth Hour
Why is the world switching off its lights tomorrow for Earth Hour?
Major global landmarks switch off the lights for Earth Hour 2018
Inside the £26m bunker powering the City from down below
Iconic London landmarks dim their lights to mark Earth Hour
