Question

which of the following can intensify global warming through feedback loops?
a. enhanced natural growth of forest plants
b. melting ice caps and deforestation events
c. widening of river paths due to rainfall
d. increased snowfall in temperate regions
how does deforestation affect the carbon cycle?
a. it decreases the amount of ocean currents
b. it creates more stable seasonal changes
c. it promotes plant diversity in cities
d. it increases carbon dioxide in the atmosphere

Explanation:

First Question (Which of the following can intensify global warming through feedback loops?)

• Option a: Enhanced forest growth absorbs more CO₂, reducing warming, not intensifying.
• Option b: Melting ice caps reduce albedo (more heat absorption), deforestation reduces CO₂ absorption—both create positive feedback loops to intensify warming.
• Option c: River path widening from rainfall is not a direct feedback for global warming intensification.
• Option d: Increased snowfall in temperate regions increases albedo, reflecting heat, which would mitigate warming.

• Option a: Ocean currents are unrelated to deforestation’s impact on the carbon cycle.
• Option b: Seasonal changes stability is not a direct carbon cycle impact of deforestation.
• Option c: Plant diversity in cities is not related to the carbon cycle impact of deforestation (deforestation reduces overall plant biomass, not promote urban diversity).
• Option d: Trees absorb CO₂; deforestation removes this sink, releasing stored carbon and reducing absorption, thus increasing atmospheric CO₂.

Answer:

b. Melting ice caps and deforestation events

Second Question (How does deforestation affect the carbon cycle?)