Communicates something of the massive global impact of our careless, though officially encouraged, consumption, even if Armstrong's outsized ambitions threaten to dissipate some of the movie's force.

An engaging and urgent attempt to make us all see sense about climate change.

Though this narrative device can feel a bit gimmicky and grandiose, it also provides a visual and emotional power that drives home this absorbing film's crucial cautionary message.

An eye-opening look at individual contributions to global warming.