Why is Memorial City lit up Green?

So Memorial City, other areas, and the hospital all have the lights lit up as always. Red, white and blue for the 4th. Orange or Red for Astros/Dynamo and Rockets, etc.

Lately I’ve been seeing Green. Sometimes it’s randomly green (aside from St. Patrick’s Day). But I can’t search up why. In fact, I kinda wish there was a reference for the color schemes sometimes.

Anyways, why has it been green the passed few days? My only thought it could be because of the flooding tragedy, but I’m not sure.