In any control system that is functioning properly, the methods used to control a signal won’t be correlated with the signal they’re controlling.
Worse, there will be several variables that DO show relationships, and may give the wrong impression. You’re looking at variables A, B, C, and D. You see that when A goes up, so does B. When A goes down, C goes up. D never changes and isn’t related to anything else — must not be important, certainly not related to the rest of the system. But of course, A is the angle of the road, B is the gas pedal, C is the brake pedal, and D is the speed of the car.
In the past, GDP and resources use have always been tightly correlated. But this is just drawing a line through some data — it’s not based on any deep theory. And in fact, these correlations can change very quickly. Just as one example, here’s energy use versus GDP since 1949.
If you were sitting in 1970, you could look at this curve and claim, very confidently, that economic growth requires concomitant increases in energy use. And you’d be wrong. Because the trend is your friend til the bend at the end.
B&W photo is from my camera, second photo of shelves from linked article.
Upon stumbling upon it, you might imagine a story of a college athlete who fell from society’s grace, but rumor has it, this unusual sight is actually an art installation that just “popped up” in May of 2014 and has been steadily expanding and attracting visitors who sometimes add their own trophies to the collection. Although the trophies are not bolted to the four metal shelves in any way, free to be taken, people just don’t.