In reply to GrahamD:
I think that putting the results in a way that is more accessible to the audience is also important though, the title of the presentation in question being a good example.
If it has the ability to appeal to a wider audience than just journals & peer reviews, despite being a little bit blunt, then surely that's a good thing?
As for yes/no, if that's what it takes to make a difference in this case then it could well be useful to ignore the fact that nothing is yes/no and just tell the uninformed it is for the sake of the planet.