Changes and Monitoring

Question 1

Positive feedback example

Answer 1

Rising CO2 levels –> Rising temperatures (in Tundra) –> Arctic sea ice and snow melts –> More sea and land exposed; albedo increases –> More sunlight absorbed –> Tundra warms –> Permafrost melts –> More carbon dioxide released into the atmosphere

Question 2

Negative feedback example

Answer 2

Rising CO2 levels –> Increased photosynthesis –> Carbon fertilisation; excess carbon dioxide extracted from the atmosphere –> Stored in biosphere –> Much returned into the long carbon cycle –> Soil; ocean