Asimov's Exponential Curve

(I have been searching through my old Analogs and Amazings trying to find the original article, but have been unsuccessful. If anyone knows where to find it, please let me know.)

In the 70s Isaac Asimov wrote an article in which he described the exponential changes occurring in human history. He showed that no matter how changes were measured, whether by population growth, energy use, complexity of tools, etc., the rate of change has followed the same exponential curve.

At that time we were well past the slow-rising beginning of the curve. We have now moved into a much steeper part of the curve.

We are at a point where the future of humanity is in our own hands. Whether or not we have a future depends on how far-sighted we are in protecting humanity from itself. The ominous silence from the stars may indicate that such far-sightedness is rare in the universe - that countless civilizations have failed to save themselves from short-sighted politics, superstitious violence, and run-away technology.