People around the world switched their lights off for an hour to raise awareness about climate change on Saturday in support of Earth Hour 2015.
'Earth Hour' is a worldwide movement organised by WWF which unites people to protect their planet.
This lights-off event took place on 28 March this year between 8:30 pm to 9:30 pm. Interestingly, for the first time, Cameroon, the Central African nation and the Democratic Republic of Congo, joined 169 other countries and territories across 24 time zones to celebrate the event.
"We do this (turn out the lights) each year to call attention to the need for climate action now and the brighter future that lies ahead if we act together," PBS NEWSHOUR quoted U.N. Secretary-General Ban Ki-Moon as saying.
From Paris' iconic Eiffel Tower to Empire State Building in New York, many big places saw lights going off on Saturday night.
'Earth Hour' was started in 2007 in Sydney, Australia, and has spread around the world since then.
Last year nine million people in the UK alone joined a record-breaking chain of 162 countries.
Check out the above slideshow of 'Earth Hour 2015'.