Effects on Drag

This plot is found in "Effect of High-Fidelity Ice Accretion Simulations on the Performance of a Full-Scale Airfoil Model", Broeren, Bragg, et.al., 2008
This plot shows the angle of attack on the bottom axis, the coefficient of drag on the left axis.

Look at the area within the red box.

How long will you be able to maintain altitude?

What happens to angle of attack when you try to maintain altitude?