In the given passage, the author discusses the impact of climate change on various ecosystems around the world. The text is structured to first introduce the general concept of climate change, followed by specific examples from different environments, and concludes with a call to action for conservation efforts.

Passage Excerpt: 'Across the globe, ecosystems are undergoing alarming changes due to climate change. In the Arctic, melting ice caps threaten polar bears, while in the Amazon, deforestation exacerbates heat and drought. Coastal regions see rising sea levels encroaching on coastal cities, unsettling human and animal habitats alike. These shifts not only endanger wildlife but also impact human populations dependent on these ecosystems. Therefore, it is imperative to adopt sustainable practices aimed at conserving these critical environments while advocating for policy changes that address the root causes of climate change.'