(a)[1]
Calculate the overall percentage of energy in Fig. 5.1 that was obtained from fossil fuels.
(b)[1]
Explain why fossil fuels are not sustainable resources.
(c(i))[2]
State the names of two other processes that add carbon dioxide to the atmosphere.
(c(ii))[1]
State the name of one process that removes carbon dioxide from the atmosphere.
(d)[2]
Describe the environmental effects of an increasing carbon dioxide concentration in the atmosphere.
(e)[3]
Describe how modern technology has increased crop plant production.