Best way to explain why power changes altitude

[pwapilot]

I loved your post. Far more precise than my own. I think you had a mistype though. On the front side, higher speed gives (T<D) or a descent, not a climb. However, pulling up on the front side lowers your speed and reduces drag. Giving (T>D) or a climb. So the bold should read, at this new, lower speed, you now have excess thrust,.

That's correct, I intended to say "lower speed." Thanks for catching that!