The link below is to an article detailing a complaint filed in Canada against climate change denier groups, including The Friends of Science, The International Climate Science Coalition, and the Heartland Institute. The complaint details how these groups have posted false and misleading billboards in an effort to confuse the public on climate change in order to benefit the fossil fuel industry. What I find interesting is how the denier groups had been found in violation of the law before, a finding which was upheld on appeal, and then they went ahead and put up new antiscience billboards. It would seem to me it should be an easy decision on the part of the Canadian government to charge them. If they were told once to stop doing it, then went ahead and did it again, the next thing to do would be to charge them with a crime. I also liked how they will have the grounds to demand a list of their donors if they pursue an investigation. That would be great to see.
We'll need to watch how this one turns out. Hopefully, these groups will have to explain themselves in court.
Update: Here is a link to the entire filing (Thanks to cunuduin).