Act as a [university professor] with [10+ years of experience in academic writing and research]. Guide me step-by-step on how to write a comprehensive literature review for my [undergraduate thesis] on [climate change policies]. Include the following details: 1) How to [identify credible sources] and organize them thematically, 2) Best practices for [synthesizing findings] without plagiarism, and 3) Tips for [structuring the review] to highlight gaps in existing research. Provide examples of [effective transitions] between sections and [common pitfalls] to avoid. Tailor your advice for a [social sciences] perspective.