In Pictures: Hanoi turns off the lights, turns on the “green” future for the Earth The Earth Hour 2023, with the theme “Saving electricity - Becoming a habit”, was held in Hanoi at 20:30, on the evening of March 25. Many streets in Hanoi simultaneously turned off their lights, while small candles were lit, as a green message towards the goal of net zero emissions by 2050, according to Vietnam’s commitment at the 26th Conference of the Parties to the United Nations Framework Convention on Climate Change. 08:32 | 27/03/2023