# Neutralizing The Earth's Charge

The Earth's surface has a negative surface charge density of $1/10^9\,\mathrm{C/m}^2$. The potential difference of $400\,\mathrm{kV}$ between the top of the atmosphere and the surface results in a current of only $1800\,\mathrm{A}$ over the entire globe. So a naive calculation of the rough time required to neutralize the earth's surface comes out to $283\,\mathrm{s}$ which seems too small.

Why doesn't this happen in reality?