This question is about Earth's greenhouse gases and climate.
The graph below shows how atmospheric nitrous oxide (N2O\text{N}_2\text{O}N2O) concentration and the global surface temperature anomaly have changed between 1970 and 2020.
a.[2]
Evaluate the information shown in the graph. To what extent does the graph support a link between atmospheric nitrous oxide levels and global warming?
b.[3]
Describe and explain how the greenhouse effect maintains the temperature of the Earth.
c.[1]
State one human activity that can cause an increase in atmospheric nitrous oxide levels.
d.[2]
State two environmental effects of an enhanced greenhouse effect.