If all of Humanity ran East, would the Earth's rotation slow down? If all of humanity (and perhaps the animal kingdom too for good measure) were to run East at the same time for a prolonged period of time, would the equal and opposite force of their feet pushing the ground west behind them slow down the Earth's rotation?

 A: As it's 4.20 am where I am, and I am pretty dreadful at simple arithmetic, I welcome anybody to refine this calculation, a wiki, if you will.
Any frills to the topic, such  how long they would need to walk to make a significant difference, are welcome. But any pedestrian material or remarks will be ruthlessly eliminated. Except that previous line.
Ok, The angular momentum of the spinning earth is: 
$I = [2/5]mr^2$ and $ω$ = $2π/T =[ 2π/86400]$ rad/s 
$mass = 5.978×10^{24}kg$, 
$radius = 6.378×10^6m$ 
$L = [2/5]×5.978×10^{24}×6.378×10^6×6.378×10^6×[ 2π/86400]$ 
$L = 7.074 ×10^{33} kg.m^2s^{-1}$. 
My (simple, naive) idea is to calculate the force exerted by these walking people, and I make the following sweeping assumptions.
The number of people on Earth is 7.5 billion ( give or take the odd million) and I assume they average 40 kg each. This produces a total mass of $3 × 10 ^{11}$ kg
I then assume that every second, they take one step forward, on a  synchronised system, so resulting in a push backwards against the Earth and treating this as an acceleration, this produces  a force of $3 ×10^{11} kg.m/s^2$
So you have a force of $3×10^{11} kg.m/s^2$  trying to reduce an angular momentum of $ 7.074 ×10^{33} kg.m^2s^{-1}$.
It may take a while to notice any change. 
Since answering this question, I have VTC as there is a duplicate here:
Can humans slow down the Earth?
