When and where did the concept of the Earth Hour started?

A. June, 2007 in Christchurch, New Zealand

B. May, 2009 in Colombo, Srilanka

C. April, 2008 in Tokyo, Japan

D. March, 2007 in Sydney, Australia

Answer: Option D

Solution(By Examveda Team)

The 2007 Earth Hour was held on March 31 in Sydney, Australia at 7:30 pm, local time. Since then it has grown to engage more than 180 countries and territories worldwide.