In Pictures | When lights went out across the globe to celebrate Earth Hour 2016

A college student adjusts a model globe made of 2016 bottle caps to mark the upcoming Earth Hour in Zhenjiang, Jiangsu province- Reuters

Sydney Harbour Bridge before and during Earth Hour in Sydney, Australia- Reuters

Sydney Opera House before and during the Earth Hour in Sydney, Australia. The Sydney Opera House, normally brightly lit, switched off its lights at 8:30 p.m. (0930 GMT)- Reuters

Luna Park entertainment area before and during Earth Hour in Sydney, Australia- Reuters

A general view of the Taipei skyline shows the Taipei 101 building before and during Earth Hour in Taipei, Taiwan- Reuters

A general view of central Tokyo with the Tokyo Tower before and during Earth Hour in Japan- Reuters

A view of the tourism icon Merlion before and during Earth Hour in Singapore- Reuters

The skyline of the central business district in Singapore before and during Earth Hour- Reuters

The National Aquatics Center, also known as the "Water Cube" seen behind an installation celebrating the Chinese lunar calendar year of monkey, before and during Earth Hour at the Olympic Park in Beijing, China- Reuters

China's National Stadium, also known as the "Bird's Nest" behind a monument symbolizing the Olympic torch, before and during Earth Hour at the Olympic Park in Beijing, China- Reuters

The Biyong Palace inside the Guozijian Imperial Academy before and during Earth Hour in Beijing- Reuters

The Grand Palace in Bangkok before and during Earth Hour- Reuters

Garuda Maintenance Facility (GMF) hangar before and during Earth Hour at Soekarno-Hatta airport near Jakarta, Indonesia- Reuters

Participants display their hands with neon paints during the Earth Hour in Pasay city, metro Manila- Reuters