This year, like every year since 2007, the world's most iconic buildings will go dark for one hour to make a symbolic "bold" statement about concern for climate change.
Hundreds of millions of people around the world will also shut off their lights this Saturday evening from 8:30-9.30PM (March 31) for Earth Hour.
Last year, 5,200 cities and towns in 135 countries switched off their lights.
You see, although the world's governments still haven't managed to take action, many, many, many people are aware of what is happening to our planet - and do care.
The LEED-Gold Empire State Building is one of those buildings. Luckily, it's done more than turn the lights out - it recently finished a retrofit to reduce the building's carbon emissions more than 38% using a process that can be replicated by all existing commercial structures worldwide.
Some of the other iconic buildings that will go dark: the Eiffel Tower, Sears/Willis Tower in Chicago, the Space Needle in Seattle, the Sydney Opera House in Australia, and the National Cathedral and the Smithsonian Castle in Washington, D.C.
Hundreds of buildings in Chicago, NY, San Francisco and all the major cities of the world participate.
Visit the Earth Hour website to see all the groups that have signed on, from the Girl Scouts to the world's football governing body FIFA.
Although there's little time to see our vision come true - houses everywhere covered in solar panels, walkable towns and locally produced organic food - we take this moment where darkness covers the Earth to remember that we are all in this together.