Study the table below (Figure 1), which shows the historical and predicted global energy mix (percentage share of total energy consumption) from 1980 to 2050.
| Year | Coal (%) | Oil (%) | Natural Gas (%) | Nuclear (%) | Hydroelectric (%) | Solar and Wind (%) |
|---|---|---|---|---|---|---|
| 1980 | 30 | 45 | 15 | 4 | 5 | 1 |
| 1990 | 32 | 40 | 17 | 5 | 5 | 1 |
| 2000 | 35 | 35 | 18 | 6 | 5 | 1 |
| 2010 | 38 | 30 | 20 | 5 | 5 | 2 |
| 2020 | 34 | 27 | 24 | 5 | 5 | 5 |
| 2030 (predicted) | 25 | 20 | 28 | 7 | 5 | 15 |
| 2040 (predicted) | 15 | 12 | 25 | 10 | 6 | 32 |
| 2050 (predicted) | 5 | 5 | 15 | 15 | 10 | 50 |
Analyse the reasons for the past and predicted changes in the global energy mix.
