There are no "Marxist" countries on the planet. I'm not sure there ever were. I think I understand what you're trying to say, but someone could very easily take what you wrote as the suggestion that there are two types of countries: "capitalist" and "non-capitalist (Marxist)". That's... you should actually read Marx, or decide on a less fraught descriptor.

For that matter, how much of the ecological devastation in these poorer countries is being caused by a Western mining company or Western oil company or a Western baby-formula company?