Plan B 2.0: Rescuing a Planet under Stress and a Civilization in Trouble by Lester Brown

I have become terribly disturbed by the accounts of what can happen to the Earth as climate changes produced by global warming disrupt the environment. I believe the majority of scientists who assert that we humans are the cause of the problem and I'm frustrated by the lack of urgency displayed by our governments and the general population. If we continue "business as usual," is it already too late to prevent disaster? Reading Plan B 2.0 gave me some hope that things can be done. What now can an ordinary citizen do to get the world to act on this?