The US energy consumption rate for 2011 is available in existing public data [bp.com/statisticalreview] "BP Statistical Review of World Energy." Assuming a 2% growth rate per year, find the doubling time [yrs] and estimate the energy consumption rate [MTOE] in the year 2050. Also, assuming that current US coal reserves supplied all the fuel energy for the US, estimate how long the coal would last [yrs].