Suppose Scientists Discover (Somehow) That If $\Delta T$ , the Average Global Temperature Increase Since 1900, Were to Average

Multiple Choice

Suppose scientists discover (somehow) that if $\Delta T$ , the average global temperature increase since 1900, were to exceed $1.0^{\circ} \mathrm{C}$ , Greenland's ice sheet would irreversibly start to collapse within 20 years, raising ocean levels significantly. $\Delta T$ is currently $0.8^{\circ} \mathrm{C}$ . What might we do to prevent this from happening?

A) Cut $\mathrm{CO}_{2}$ emissions in half.
B) Completely stop emitting $\mathrm{CO}_{2}$ now.
C) Actively start removing $\mathrm{CO}_{2}$ from the atmosphere.
D) We probably can't prevent this from happening, no matter what we do.