Greg Toppo:

In 2006, An Inconvenient Truth shined a light on global warming, bringing images of collapsing ice sheets and drowning polar bears to multiplexes nationwide.
Could 2010 be the year moviegoers get the angry urban parent with a hand-drawn placard, demanding more high-quality charter schools and an end to teacher tenure?
This summer, no fewer than four new documentaries, most of them independently produced, tackle essentially the same question: Why do so many urban public schools do such a bad job — and what can be done to help kids trapped in them?
Among the new films: