Sarcasm aside, I love swamps and I hate mosquitoes, other bugs and crocodiles because they don't let me enjoy the swamp. I also don't like cities nor agriculture for the same reason. But I like people and people being happy.
Humanism and environmentalism are at odds more often than they are not.
It gets less surprising when people realize that nature is red in tooth and claw, an uncaring shithole we're evolutionary conditioned to find pretty - at least the parts we see. Beautiful meadows and happy animals and careless people are just propaganda - in reality, the people are sick and busy with back-breaking work, and animals are all on the verge of starvation, and that doesn't even touch the microbiological scale. Ecological balance is achieved by means that, when applied to balance between humans, we'd call unending war of attrition.
Humanism and environmentalism are at odds because nature doesn't care about humans anymore than it cares about anything else. Brutal death and constant suffering are hallmarks of nature.
In any case, I can't elaborate on the things I say without understanding what exactly you take issue with.