Green parties vary from place to place. Some -perhaps the Australian one, certainly the German party- have moved to a more comprehensive array of subjects. Others don't.
Personally, I think the environment must be protected. I do worry about climate change, CO2 generation, deforestation and the general ripping of nature in the sake of "progress". Effective policies must be held, worldwide, to stop and reverse these phenomenae.
All this said, I disagree with the core of "green" activism.
"Green" activism is often used as a pretext for protectionism (uncompetititive farmers claim that imported tomato has too many toxines or is transgenic, uncompetitive fishing companies argue that too many dear little dolphins are killed while capturing tuna fish, etc).
All the claims I've read about about transgenic crops are unsubstantiated. They are based on fear and ideology. "There's no country without maize", say the Mexicans, and corn production drops and we have to import the basic staple from the US.
Same thing goes for nuclear power. Yes, we got Fukushima and Chernobyl: one froma a natural disaster, the other, from a societal disaster. Yes, eolic energy is a good alternative. So is solar energy. But, at the moment, being anti-nuclear for the hell of it comes only from some sort of Hiroshima bad conscience, IMHO. Thermoelectrical energy is more polluting, and hidroelectrical energy would be OK if only the new dams would not terribly affect the environment and way of living of the communities nearby.
Then there are the first world defenders of the status quo, who want the poorer countries (The Noble Savages) to remain in their underdevelopment for the sake of Mother Nature and the homeostasis of earth, while they gauge in their motorboats to stop whale killing.
And last, but not least, the so-called animal lovers. There was a question in the "European test" about eating meat: is being a vegetarian somehow leftist? I doubt it. Not to say those freaks who want to ban experiments on animals. They don't mind human step cells (I don't, either), but don't touch the rat or the ape. How many human lives have been saved by such experiments? How many illnesses have been cured?
And I don't really give a damn about the baby seals and their big eyes while they're whipped to death by Canadian hunters. If the seals were not cute and photogenic, very few people would care! Just imagine they were snakes. Then?