After review, use a valid arithmetic sequence:

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Mastering Sustainable Energy: An In-Depth Review & Future Outlook In an era defined by climate urgency and energy demand, sustainable energy solutions have transitioned from niche experiments to mainstream necessity. After extensive review of global trends, technological advances, and policy developments, a clear arithmetic sequence emerges that outlines the trajectory of sustainable energy progress: 2 → 6 → 18 → 54 — a geometric acceleration reshaping global power systems. --- ### Understanding the Sequence: A Step-by-Step Breakdown