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# The objective is to find the number of years at current total human energy | |
# use it would take to decrease the temperature of the Earth's 'core' by one | |
# degree Celsius. The maximum depth of the crust is 100 km so we'll offset | |
# the average radius by that amount to get the volume, multiply by the | |
# average density to get the mass. Then we'll multiply by the mass-weighted | |
# average specific heat and then by 1 °C to cancel things out. | |
# Using the equation Q = m Cp ΔT, we find the total energy available from | |
# that one degree drop. Divide by the current total human energy use per year | |
# to arrive at the number of years it would take. |