I lost my trust for this film. I don't want to be mad at a documentary I agree with, but I don't know who this is for.

It's all there, in a busy mega-mix doomsday file that, courtesy mostly of the research scientist Johan Rockstrom (also on camera throughout), warns that our time on Earth is almost up.

This unabashed infomerical is broadly affirming, but now I'm worried about the future of urgent issue documentaries.

The information is good, but it's hard to predict how many will be willing to sit through what sadly amounts to little more than a dull university lecture.