Earth Hour event held worldwide

Photo taken on March 30, 2019 shows the lights on of the Greek Parliament prior to the Earth Hour event in Athens, Greece. Several landmarks across Greece went dark on Saturday, joining global efforts to raise awareness about climate change to save the planet. Earth Hour is a global initiative first launched by World Wildlife Fund (WWF) in 2007 and soon became a popular movement worldwide. (Xinhua/Marios Lolos)