View of a windmill farm in La Ventosa, Juchitan community, Oaxaca State, Mexico. (PATRICIA CASTELLANOS/AFP/Getty Images)

This weeks question comes from David Burtt in North Gower, Ottawa. David asks:

I am curious to know the effects on climate that may be caused by the very large wind turbine farms. The turbines are obviously absorbing energy from the wind, so is there an effect "downstream", from the farm?

We went to David Johnson, a [WISE Member and] Professor of Mechanical Engineering at the…