Scientists are very concerned about the changes in the concentration of greenhouse gases, such as methane, in the Earth's atmosphere.
Figure 1 shows the concentration of atmospheric methane (CH4\text{CH}_4CH4) between 1995 and 2021.
a.[4]
Describe two patterns shown in Figure 1. Use data from Figure 1 in your answer.
b.[2]
Give two human activities that increase the concentration of methane in the atmosphere.
c.[4]
The trend shown in Figure 1 may continue for many years. Explain what effect the rising concentration of greenhouse gases like methane could have on living organisms.