Earth Day has been held since 2007 on the last Saturday in March.
This annual event is organized by the World Wildlife Fund (WWF) to raise an awareness about environmental issues.
This year marks the 18th edition of Earth Hour, with the theme "Biggest Hour for Earth."
The event encourages people worldwide to turn off their lights for 60 minutes from 8:30 p.m. to 9:30 p.m. as a symbolic gesture of support for our planet.