Companies fail all the time and it is critical to ensure that bad systems are not allowed to continue. A government doesn't fail. It's issues are enabled to continue unabated.
The ultimate issue with a centrally planned economy is not environmental though. It is putting additional power into the hands of a majority which gives minorities no recourse. At least in a capitalist country minorities can form their own communities and local economies. If the majority wants to allocate food and resources to the majority in a centrally planned system, the minorities starve. Sure, there are still issues in capitalist systems with regulations targeting minorities and the stealing of resources like Tulsa but there's no recourse at all in a centrally planned one.
Vietnam transitioned from central planning before even the Soviet Union.
Are you really sure Cuba is the best example right now? Go look into how they are doing and get back to me. I won't claim that a centrally planned economy cannot be efficient when the leadership places great emphasis on it. Cuba has some very efficiently run state programs. They are also unfortunately not very nimble.
Central planning can make for some oppressive and robust environmentalism. We see that in Cuba. It also works the other way. What makes you think that after the revolution you will be the one making the decisions and the same grifters won't take part in that system for their own benefit?
What happens when the needs of the state outweigh the needs of the world? Does the majority in any country really care about the environment over jobs and prosperity? How likely is this central plan to place a focus inherently on resource efficiency and actually be successful without an incentive when lives are on the line? We know from the few large centrally planned economies that they've largely failed at that task rather dramatically.
All of this should not be weighed against hands-off capitalism but instead the modern liberal mixed system. Externalities are covered with regulations and government programs based on contracts and markets. That's reformed capitalism.
Reforms to socialist systems have not addressed the core issues of power imbalance but instead, allow corporations as long as they align with the efforts of the state and the majority. That's literally economic fascism and comes with all its own issues.
There's a lot more that can be covered here including numbers that support these narratives but there's a reason the Western left shifted from a revolution to a reform mindset in the 1960s and it largely follows the above logic.