A. World Wide Fund for Nature
B. united nations educational, scientific and cultural organization
Correct answer: a
"Earth Hour" is a global energy-saving activity proposed by the World Wide Fund for Nature (WWF) to cope with global climate change. It is proposed that every year at 20: 30pm local time on the last Saturday of March (2065438+2008 Earth Hour time is 20: 30pm on March 24th), households and business users turn off unnecessary lights and power-consuming products for one hour to show their support for climate change action.