WWF marks Earth Hour's 20th anniversary amid growing climate concerns.

Earth Hour, launched in 2007 in Sydney, marks its 20th anniversary amid growing global climate concerns. Initially sparked by scientific consensus and Al Gore's documentary, the campaign united over 2.2 million people in Sydney by turning off lights. Today, WWF emphasizes the event's broader purpose: fostering collective action and awareness beyond simple energy conservation to address the intensifying climate crisis.