I agree that it's more about the green movement. What my first impression was is that this was a sarcastic way to point out our flaws and that people are using the excuse that "we're only human" I think he's trying to say that it isnt a good excuse and we know we shouldn't be "paving over paradise" or cutting down forests or whatever, but we do it anyway because we're "only human". I think the "so far" part is saying that he thinks we as humans have much more potential and maybe in the future we'll realize our mistakes and stop using this excuse.
I agree that it's more about the green movement. What my first impression was is that this was a sarcastic way to point out our flaws and that people are using the excuse that "we're only human" I think he's trying to say that it isnt a good excuse and we know we shouldn't be "paving over paradise" or cutting down forests or whatever, but we do it anyway because we're "only human". I think the "so far" part is saying that he thinks we as humans have much more potential and maybe in the future we'll realize our mistakes and stop using this excuse.