1.1. Fig. 3.1 shows the contribution of different sources of energy to the total amount of electricity generated in three countries.

State the largest source of renewable energy used by the three countries shown in Fig. 3.1.

1.2. State one other source of renewable energy other than those shown in Fig. 3.1.

1.3. Climate change can result in drought. Explain how droughts can lead to energy insecurity in Brazil.

1.4. Suggest why Costa Rica might be described as being more energy secure than Iceland.