There is a good article in the Times Online at the moment: "Blunt warning about greens under the bed".
The idea of red=green is not new, but it is well written:
His band of angry young men would find Gore where once they found Marx
Where once they raged about the fleecing of the proletariat and quaked at the march of fascism, Blunt and his circle, transposed to today’s college bar, would rage about the fleecing of the planet and quake at its imminent destruction. If you squint, red and green look disarmingly similar.
My desire to live a free, mundane life is a fundamental cog in our messy, glorious, capitalist democracy. It is built on millions of such small entrenched postitions. Red-filtered, my desires are despicable and bourgeois and must be beaten out of me with indoctrination or force. Green-filtered, my small desires are despicable acts of ecological vandalism. My house is a carbon factory. My desire to travel, to own stuff, to eat meat, to procreate, to heat my house, to shower for a really, really long time; all are evil.
This last bit is very well put. Environmentalism is all very well until it actually intrudes on our lives. At that point it is really no different from communism in its impact, whether environmentalists are communists or not.