Describe one positive thing about the greenhouse effect and one concern that we currently have about it.
A. Positive: Maintains Earth's temperature suitable for life; Concern: Enhanced greenhouse effect leading to global warming.
B. Positive: Facilitates agriculture in colder regions; Concern: Disruption of ecosystems due to climate change.
C. Positive: Supports natural greenhouse gases; Concern: Increased frequency of extreme weather events.
D. Positive: Facilitates carbon dioxide absorption by plants; Concern: Rising sea levels due to ice melt.