12. At the start of 2010, world natural gas proved reserves totaled 6609 trillion cubic feet, while annual consumption was 119 trillion cubic feet in 2011. The EIA projected in 2010 that world consumption would increase 1.0% per year through 2035.
What was the static reserve for natural gas at the start of 2010?
What was the exponential reserve for natural gas at the start of 2010?
What considerations may affect the answers to parts and (b) over time?