It's pretty funny you think you know what you're talking about. I'm not a "leftist," but your descriptions of leftism are based on falsehoods and mystifications about the accumulation of wealth (capital), the source of which is labor, or more specifically, appropriated labor (surplus value). This means a person is able to accumulate capital by buying labor for less than what it's worth. Capital, an abstract power, is something that uses itself to increase its own exchange value. It is beholden to no one, not even capitalists or the titans of industry. It's in its nature to grow (otherwise it risks destruction/subsumption under bigger capital). One of the methods of increasing the profit margin is externalizing costs. One cost is associated with damages to nature (to the ecosystem, aesthetic value, etc). If for example a mining company can get away (not pay for) with poisoning the water supply, why care about it? And lastly, why won't democracy/the State stop them? The State is an inherently reactionary institution that forces any real movement into channels that don't threaten the bourgeoisie. It's a mediator between the two contradictory classes, but far from being a neutral agent, it represents bourgeoisie interests (in preventing true consciousness, legitimizing itself and the use of violence, protecting commodity relations, etc.) People have a vested interest in protecting the environment (they suffer the consequences of pollution). A fascist would have no problem culling the human population to reduce CO2 emissions for e.g.. But, instead of solving the problem (fascists aren't so inclined to go against capitalism), they'd have less people to feel the effects of environmental degradation. What we want is for society to not be burdened by the externalized costs of profits, for people to have more freedom.