Bigger the Turbine, The Greener the Electricity? - Wind Power

Wind power is a great renewable energy source. With the decreasing investment costs, a lot of people are turning there heads towards wind energy. After gathering a lot of statistics, some institutes from Switzerland have been deduced that the larger the turbine is, the greener the electricity becomes.
I just read the article about it here: #-Link-Snipped-#

Want to know the views of engineers here on this.