Earth Hour begins Saturday at 8:30 p.m. in every time zone. BC Hydro tallies Earth Hour savings by comparing electricity use from the same hour from the previous week. The WWF says the way hydro companies track electricity savings during Earth Hour is not an accurate measure of participation. For 2018, the WWF has shifted the focus of Earth Hour to ask participants to start discussing and acting on the loss of wildlife across the globe. BC Hydro says in its report that the symbolism of Earth Hour is still important to British Columbians.

Source: CBC News March 25, 2018 02:26 UTC