To save the planet, what do we have to do and how soon do we have to do it?  What can citiizens do to keep the CO2 levels in the atmosphere below the tipping point -- where it might be too late?  Enviornmental Law Professor Mary Wood says we must all act now.  She talks with the Old Mole's Laurie Mercier about specific actions we can (and must) take.  Wood is the author of Nature's Trust: A Legal Paradigm for Protecting Land and Natural Resources for Future Generations; and The Dawn of Planetary Patriotism: A Citizens' Call to Climate Defense, co-authored with Heather A. Brinton.