Final answer:
The statement about wind turbines being a blot upon the landscape is an opinion, not a fact, contrary to the other verifiable statements listed in the question.
Step-by-step explanation:
Among the provided statements, the one that is NOT a fact is "Wind turbines, some of which are 127m in height, are a blot upon the natural landscape." This statement is an opinion as it expresses a subjective judgment about the aesthetic impact of wind turbines on the scenery, which can vary from person to person. In contrast, the other statements can be verified objectively. For instance, the total number of wind farms in Wales is a quantifiable figure (Statement A), the comparison of turbine heights to other structures can be measured (Statement C), and the existence of protests based on potential impacts on tourism is an observable phenomenon (Statement D).
The emergence of wind energy presents both opportunities and challenges. While wind turbines are a source of renewable energy and can contribute to economic sustainability through extra income for farmers and environmental benefits like no air pollution or water usage, there is regional variability in wind production, potential disruption of habitats, and aesthetic and noise objections. Despite these challenges, the overall life cycle analysis indicates that turbines produce significantly more energy than that used in their production and installation.