as you may know, i think most leftists who are left of, say, obama, are post-marxists, whatever they may say: they are still trying to make marx's predictions come true, still trying to read history through his lens. no empirical data can budge or change this at all: it has nothing to do with reality, but with the emotional momentum of a century-and-a-half old quasi-relgion started by a prophet/messiah with the power to foretell the future (admittedly, he asserted that it was scientific, but so did many eschatological preachers of the 19th century).
so here are some aspects of the content. first of all, since we haven't flown as predicted into the commmunist ecstasy at the end of history, we must still be in the phase of capitalism. so we don't even notice that capitalism and socialism have merged: that it's state/corporate economic/political/military power that's the problem. but, it has to be odd for any marxist to think that capitalism has avoided the terminal crisis as the prophet predicted. starting as long as a hundred years ago, marxists referred to the contemporary phase - whatever it was at the time - as late capitalism, a lovely expression of wishful thinking. seems like you'd get embarrassed about that as the decades tick by, and i would have suggested a number of other dialiectical phases: "late late capitalism," "extremely late capitalism", "unbelievably late late capitalism" and so on.
maybe they got too embarrassed by this approach, though they are not folks who are easily embarassed. so now we're in "neoliberal capitalism" or perhaps since we're thirty years past reagan and thatcher, we're in "late neoliberal capitalism." well the power of capital and political/miltary systems connected with it just keeps consolidating, shows no sign whatever of disintegrating: quite the reverse. so this is where climate change comes in: it will provide the terminal crisis of capitalism: it is the realization of prophecy. people, i must say, are sitting home wanting it to be as bad and imminent as possible, and asserting - while brooking absolutely no dissent - that it is as bad and imminent as possible. it's still science, too.
anyway, i have no idea why you'd want to enter into this line of thought, or even how you'd go about making yourself believe stuff like that, but it is very pitiful. the left has just got to got to got to grab something else, or worship a new messiah or something, cause this shit is boring and ridiculous and interminable.