A lot of Canadians will be joining millions of others around the world in marking Earth Hour tonight.
   
They'll be turning off all non-essential lights for one hour starting at 8:30 local time.
   
The World Wildlife Fund, the driving force behind Earth Hour says 13-million Canadians took part last year.
   
They were among an estimated 1.8-billion people in more than 150 countries who did so.
   
Ontario residents are encouraged to turn off all non-essential lighting and their electronics tonight at 8-30 for Earth Hour.
   
Toronto's C-N Tower and Niagara Falls will join other landmarks such as the Eiffel Tower, the Tower of Pisa, and Buckingham Palace in dimming their lights.

St. Catharines will participate in the campaign by turning off excessive lighting and power use in City Hall from 8:30 to 9:30 p.m tonight.

St. Catharines Mayor Brian McMullan says Earth Hour is a simple way for our residents to take action on climate change.

The event is meant to draw attention to environmental issues such as the fight against global warming.