I don't think there is any question about it. We didn't even think about environmental issues until the last century. Now if it were 50 years ago, I might agree with you, but in the past 50 years, we've done a tremendous amount to change how we treat the environment, and if you don't want to acknowledge that, I say it's a good example of why we really don't need to be doing a thing, what difference does it make...when we do make great strides in cleaning up our act, it's not acknowledged, so why bother?
When gold was discovered out west in the mid-1800s, we literally destroyed mountains with water cannons to get the gold, leaving behind useless sediment that nothing would grow in for decades, ruining millions of acres of potential farm land forever. Events like this pock human history, and they went on for centuries in the old world. It was only recently (past 50 years) that we even began to look at these problems concerning the environment. For the preceding 4 billion years, Earth looked after her own environment.