Question

Without green house effect, the average temperature of earth's surface would have been :

(a) $-{18}^{\circ }C$ (b) ${33}^{\circ }C$

(c) $0^{\circ }C$ (d) ${.15}^{\circ }C$

Answer 1

At present, roughly 30% of the incoming solar radiation is reflected back to space by the clouds, aerosols, and the surface of Earth. Without naturally occurring greenhouse gases, Earth's average temperature would be near -18°C. Hence, the correct choice is (a).