As a drug it's actually pretty benign.

But every time I buy coffee, I am feeding the beast of global exploitation and environmental damage.

Compared to drinking coffee, the alternative is: simply don't do that. And if I take the alternative, the carbon footprint, other environmental footprint reduces a bit and reduces the profits of exploitative power structures.

The industry is just a waste of fossil fuels and logistics, really, seeing as it serves no particular purpose because life runs just fine without coffee.