Diane Katz is to be congratulated for raising a flag with respect to bird mortality from wind turbines, but she only tells half of the story. If one is serious about replacing hydrocarbons with wind-generated electricity, then it is also important to know just how many turbines it would take, say, to replace one oil sands plant.
Given 250,000 barrels of oil per day, if that was used that to fire a (large) power plant, at least 6000 MW could be generated, continuously and reliably. The Wolfe Island wind facility, which has been killing birds in greater numbers than the Syncrude tailings pond, is rated at just under 200 MW, or 1/30th of 6000. So, assuming a generous availability factor of 20% in terms of reliable electricity versus installed wind capacity, it would in fact take at least 150 Wolfe Islands, totaling almost 13,000 individual turbines to replace the output of a single large oil sands plant. In addition to killing birds in flight, these would make a rather larger hole in the boreal forest, than the mine they replaced.
We should recall the original objective was not to manage CO2 or temperature per se, but rather to preserve habitats for diverse life.
Neil Edmunds, Calgary