Question

multiple choice question
the rise in greenhouse gas levels has ______.

increased earths average temperature as less heat radiation can escape earths atmosphere
increased earths average temperature as more heat radiation can pass downward through the atmosphere
caused the greater destruction of ozone as cloud formation over antarctica is more common
led to an increase in explosive volcanic activity

Explanation:

Greenhouse gases trap heat in Earth's atmosphere. When their levels rise, less heat radiation can escape, leading to a rise in the planet's average temperature. There is no scientific link between rising greenhouse - gas levels and the destruction of ozone due to Antarctic cloud formation, nor with increased volcanic activity. Also, the main effect is not more heat radiation passing downward but rather heat being trapped and unable to escape.

Answer:

increased Earth's average temperature as less heat radiation can escape Earth's atmosphere