When the Globe and Mail and the NFB launched their interactive game / documentary "Fort McMoney" in late 2013, nearly 200,000 people played. One of the last actions players were asked to take was to vote on whether we should "stop exploiting the oil sands". 77% - over 350,000 votes - said yes.
The game was so popular they are starting it again in January 2014.
Register to play at http://fortmcmoney.com/en/#/fortmcmoney.