Because I find the Green movement to have a very unhealthy dose of misanthropy. Dr. Lucas talks of the need to "control" the thrid world population and some in the GP and in other Green groups have even suggested that such "control" may have to be imposed, they often cite the brutal and inhumane One Child Policy. Malthus has been brought back from the cobwebs of the 19th century as the new Green hero, despite many demographists saying Malthus' theories were false.
I find the Green movement, maybe due to the fact that it is made up of comfortable middle class types in the first world, very much a movement that looks down upon the rest of us from an ivory tower. They place the needs of wildlife and animals above the needs of the thrid world nations to develop and lift themselves out of poverty, their dislike of China's growth and lifting it's people (a lot of them) out of poverty to first world standards.
The same applies to poorer people like myself over in the UK. They want more expensive flights or to ban them altogether (depending which group talks of the issue). In other words, make holidays out of reach for people like me and only have a few overcharghed flights or cruise trips, which only the middle classes or above can afford. A case of the moralistic affluent waging a reverse class war on those not so affluent, so fuck them.
Then there are the looney fringes of the Green movement, the Animal Liberation Front, the Earth First etc... They openly display a dislike for humans in general. The ALF oppose testing on animals which has saved countless lives and helped in medical research. Then there was that qoute from some loon in EF about why we should not mourn or assist those unfortunates in Africa dying of AIDS as it was 'Mother Nature' exacting her revenge.
Yes certain resources are finite, yes we could be altering the planets atmospheric temperature, but regressing back to a more backward era is not the answer. Humans evolve, we are a species of intelligent lifeform unique to our planet, maybe the universe. As humans are loyalties must always be to our own species and our well being, not submit ourselves to a defeatist fate or 'Mother Nature' (which does not exist, the Deep Greens/primitivists have shown themselves to be a superstitious and as dogmatic as the religious fundies here).
I favour pragmatism here. Conserve our planet for a while, enough time to sort out the problems of poverty, development etc... and then move into space. We have already found 100s of planets now and some of them could sustain us, lets work towards branching out a little. For me the answer lies in greater progression in our evolution and technology, that will save us and not regression.
Say we did regress and go back to being unadvance and more rural and all the other things the Greenies say we should do. That could save us from hotter weather, but like the dinosaurs, we could be wiped out in a flash by a meteor or some other disaster, so we need to either leave the planet someday or die with it.
Also, technologies like GM foods and nuclear power could assist us, GM foods could assist in making more food with less resources and land and nuclear energy is not a big emission producer. Yet the Greens show dogmatism in opposing it outright without regard for a proper analysis.
I know I have written a bit, but on principle I just don't trust the Green movement, they have their own agenda too and like any political force, they can twist the truth and distort whats going on to their own dogma.