Or is it the dirtiest? Today on Q, lawyer and columnist Ezra Levant faced off against environmental journalist Andrew Nikiforuk on the question of ethical oil. In his new book, Ezra Levant argues Canada's oil sands produce the most ethical oil in the world. Andrew Nikiforuk says there's no such thing as ethical oil and we need to end our dependence on oil as a fuel source. What do you think?And what do you think about the nature of our public conversation on the oil sands?