From the Ecosocialist manifesto
The capitalist world system is historically bankrupt. It has become an empire unable to adapt, whose very gigantism exposes its underlying weakness. It is, in the language of ecology, profoundly unsustainable, and must be changed fundamentally, nay, replaced, if there is to be a future worth living.
Capitalism, by its nature, isn’t concerned with sustainability, but rather with maximizing short-term profit. To stop global warming, long-term goals and objectives are needed. But implementing them means cutting into short-term profits. Which is one reason why capitalism is ill-suited to take action against global warming and a new system based on socialist principles is.