No, it's not the pollution overlay, it's the last one from the selection list.
Well, the values differ though. If I have a temperature value of "12h" in the HUD and I end the turn a different value appears in the table of past temperatures. Not a big deal, I was just wondering if there's a planetary temperature and a local one.
Maybe I didn't pay attention, but I'm quite sure that I had a similar energy balance before the brownouts happened. I'll have to keep my eyes open in the next game.
Well, in Civ 5 you even get a resource if you settle on it (IIRC), but here it was just lost in the "blast radius" of the lander. As I didn't land the lander right on top of it, but next to it.
@kasnavada: Unfortunately I don't have a save from that incident. Maybe I can reproduce it in the next game.