From an interview with Derek Hall, writer, economist, and Principal Male Speaker of the Green Party of England and Wales.
Capitalism is based on infinite economic growth, that is ecologically impossible and social injust. So if we are to tackle ecological crisis we need socialism, capitalism is totalitarian, everything ends up being based on the need to expand profit, even education is about providing a willing work force. So the future has to be red-green.
You should read Herman Daly’s “Beyond Growth.” He argues that this is a flaw inherent in the math of conmventional economics, not the capitalist system– and he offers an alternative.
He also notes that economics seeks to maximize SOMETHING. And that green economics and humanitarian economics have opposite goals. Both are inconsistent with traditional economics, but that does not mean they are compatible.