A lot of people across Ontario heeded the Earth Hour call and turned off lights between 8:30 and 9:30 last night.

The global event was launched in Australia in 2007 to draw attention to environmental issues including climate change.

Kitchener City Hall went from bright lights to black for Earth Hour.

At the University of Waterloo, students shared their pledges for the future. They also learned a few new skills that will have a positive impact on our environment.

Toronto Hydro tweeted that the city's electricity use dipped by 3.2 per cent, which it noted was the equivalent of taking 36-thousand homes off the grid.

PowerStream, which serves nine municipalities north of Toronto, reported a 4.3 per cent drop in electricity consumption during Earth Hour.

However, that was down slightly from the six per cent reduction achieved last year.