The Green philosophy is about sustainability. It takes, as its worldview, the environment, within which human society and its economy operate. It places the soaring human population within Earth’s finite capacity for resource-use and waste-disposal. If there is one thought that underpins Green belief, it is that we have one planet, to share.
The Green political movement is newer than the other two major philosophies. It gained parliamentary representation about 20 years ago. It has recently entered government in Europe. It is ready to do so, here.