Ask people who are close to the natural world: farmers, people who work the land or in some way use the land for their livelihoods. They will tell you what they are seeing isn't so good. They will tell you the changes they have seen in the past twenty years are remarkable in one way or another and unlike anything they had seen before that.
We do things much the same way as we did 50, 60 or even 70 years ago. The answers may not be wrong, but we haven't experimented to see whether they are or not.