That human activity has had and is still having a detrimental effect on local, regional, and global ecology and climate is undeniable. We do not have to go to the Lebanon or the Orkneys to see these effects. Just spend some time on the Canadian Prairies. Look at the degradation of lakes, the loss of wildlife habitat, and the quality of drinking water.
We all have profited from from modern lifestyle, but that does not mean we cannot point to waste, lack of foresight, poor practices that affect health and biosphere. Sure, the Great Male Sky Spirits may have a heavenly trout stream for us to fish in when we've crapped out, but I wouldn't bank on it. So, it is best for the generations which follow that we become better stewards.