The surface temperature of Earth fluctuates slowly overtime. The global temperature trend has been generally upward during the 18,000 years since the last glacial advance, but the rate of increase has recently accelerated. This rapid warming is probably the result of an enhanced _________________, the trapping of heat by the atmosphere. This effect is necessary for life, without it Earth's average atmospheric temperature would be about -18°C (0°F). However, humans have injected exhorbitant amounts of carbon dioxide into the atmosphere since the beginning of the Industrial Revolution.

The surface temperature of Earth fluctuates slowly overtime. The global temperature trend has been generally upward during the 18,000 years since the last glacial advance, but the rate of increase has recently accelerated. This rapid warming is probably the result of an enhanced _________________, the trapping of heat by the atmosphere. This effect is necessary for life, without it Earth's average atmospheric temperature would be about -18°C (0°F). However, humans have injected exhorbitant amounts of carbon dioxide into the atmosphere since the beginning of the Industrial Revolution.

The surface temperature of Earth fluctuates slowly overtime. The global temperature trend has been generally upward during the 18,000 years since the last glacial advance, but the rate of increase has recently accelerated. This rapid warming is probably the result of an enhanced _________________, the trapping of heat by the atmosphere. This effect is necessary for life, without it Earth's average atmospheric temperature would be about -18°C (0°F). However, humans have injected exhorbitant amounts of carbon dioxide into the atmosphere since the beginning of the Industrial Revolution. 





a) greenhouse effect
b) ozone depletion
c) red-tide effect
d) a &b
e) all of the above



Answer: A