At a rate of 18 TW, how many years could the world's oil reserves last if they total 10,000 EJ?

To determine how long the world's oil reserves could last at a consumption rate of 18 terawatts (TW), we first need to convert the energy reserves from exajoules (EJ) to terawatts per year for clarity.

1. Convert the reserves from exajoules to terawatt-hours:
   • 1 EJ is equal to about 277.78 GWh (gigawatt hours).

• Since there are 1,000 GWh in a TW and 8,760 hours in a year, we can conclude: 1 EJ = 277.78 GWh = 0.27778 TW * 8,760 hours = approximately 2.4 TW-hours.

2. Oil reserves in terawatt-hours:

   • For 10,000 EJ, the conversion yields approximately: ( 10,000 , \text{EJ} \times 2.4 , \text{TW-hours/EJ} \approx 24,000 , \text{TW-hours} ).

3. Calculate the total hours of consumption at 18 TW:

   • To find how many hours the reserves could