Sure it's largely symbolic, but what could it hurt? It's an interesting way to take time to talk to your family & friends about conservation. A way to see that other people care too. A way to ratchet up everyone's awareness.
On March 29, 2008 at 8 p.m., join millions of people around the world in making a statement about climate change by turning off your lights for Earth Hour, an event created by the World Wildlife Fund.
We invite everyone throughout North America and around the world to turn off the lights for an hour starting at 8 p.m. (your own local time)–whether at home or at work, with friends and family or solo, in a big city or a small town.
See also Embrace the Dark Side.
shoutout to Z for this