Question

which of the following gases is an important contributor to the earths current greenhouse effect?
a. hydrogen
b. water vapor
c. ammonia
d. oxygen

Explanation:

Water vapor is a major greenhouse gas. It absorbs and emits infrared radiation, trapping heat in the Earth's atmosphere and contributing to the greenhouse effect. Hydrogen, ammonia, and oxygen are not significant greenhouse - effect contributors in the Earth's current atmosphere.

Answer:

B. water vapor