The Green party isn't far left. While the Federal level is much more left-wing than it was, the Ontario provincial Green Party is still a very fiscally conservative party, typically referred to as "
blue greens" or "ecocapitalists". The Green Party is often at odds with the NDP, so combining the two would be a horrible fit.
When you consider the centre-right camps in the Liberals and Greens, Canada is about a 50-50 split between left and right.