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IELTS Reading tasks test a candidate’s ability to identify author tone, viewpoint, and attitude. In the excerpt, renewable energy is acknowledged as beneficial (“reduce carbon emissions”), but limitations are also noted (“faces barriers”). This combination reflects a balanced and cautious stance, not total support or negativity. The wrong choices illustrate common distractors: “entirely pessimistic” ignores the positive statement, while “completely supportive” ignores the mention of barriers. “Neutral” does not apply, since the author clearly expresses an evaluative opinion. According to the IELTS assessment objectives from Cambridge and IDP, candidates must analyze not only explicit information but also implied meaning, such as attitudes and writer’s perspective. Developing this skill requires practice with a wide range of academic-style texts, as IELTS passages are often drawn from journals, books, or articles with nuanced author opinions.