Any economic system that has no safeguard to the "can someone own the Earth in your system?" problem is not a valid one in my opinion.
Socialism attempts to solve the problem by stating "the Earth isn't ownable under socialism, and anyone who tries to own a piece of it is met with resistance. Anyone who tries to own a piece of land by violent means is resisted by violent means". This is the nature of socialism and its theory on ownership. Is this not something that would benefit the Earth compared to the existing capitalist system that is only limited by democracy, which has historically used, and is currently using, systemic state-sponsored violence and regime change to achieve its goals?