Tomorrow from 8:30 to 9:30pm local time, hundreds of millions of people around the world will switch off their lights and participate in Earth Hour , the largest climate awareness event ever held. As climate change will effect people on every continent, we think a united, global call for action to address the problem is needed. At Google we're working hard to be part of the solution for the climate crisis. A first step was pledging to be a carbon neutral company.