Political Parties
I'm not so sure about this one. Though we are a political science class, I don't think this is politics class. Sure, it would be interesting to find out what people think of each individual party's contribution to environmental policies, but this assumes people will give neutral, non-biased answers that do not reflect their views on the party's other policies. Some people are strongly passionate about certain parties, while they hate others. Assuming we do remove the most biased and skewed answers (from the already limited group of people who know anything at all about ALL the parties' environmental policy), I still think it would be very difficult to get anyhing useful out of this question.
But that's just my opinion on the people and their attitude towards political parties directly. I think we'd be better off doing something more appealing and directly related to people.