I am new to this forum and would like some help with the interpretation of the following regression. I hope I am in the right place.

logWaste = -1.85(logGDP) +0.1(logGDP)^2

Now I am trying to give an interpretation of what would happen to Waste if GDP increases by x%.

I usually report the elasticity easily but I am not sure how to work with this since I have two different values of GDP that I should take into account when differentiating. I hope this makes sense and someone can give me a hand.

Many thanks to all!