地球温暖化の影響は，持続可能な社会の構築を阻んでいる。各国において，地球温暖化やその影響による問題を認識し，解決に向けた取組みを行うことが求められている。日本では「脱炭素社会の実現」に向けた取組みが始まっており，学校教育の各教科等の学習において地球環境問題に関する教育を充実することが求められている。地学基礎の学習では，「脱炭素社会の実現」の理解を導くために，炭素循環の学習を行い，地球システム的な見方・考え方を育むこと望ましいと考える。本稿では，その理由を述べるととともに，炭素循環を認識させるために開発した学習課題，構想・実践した授業を報告する。

　The effects of global warming are harming our lives and society. Recognizing this situation for all inhabitants on the planet, and making efforts to resolve it are among the common problems that countries worldwide tackle to form a sustainable society. In Japan, efforts toward the realization of a decarbonized society have begun. Japan strives to enhance education on global environmental issues through school education. Therefore, in studying　the basics of earth science in high school science, it is desirable to foster perspectives and thinking about the earth by studying the carbon cycle to understand the realization of a decarbonized society. Consequently, a learning task was developed for the learner to recognize the carbon cycle based on the learned items, and a lesson was planned and put into practice to tackle the developed task. It was confirmed that learners were able to acquire cultivated perspectives and thinking about the earth, through the reports written by the learners and the description of the learners’ reflection after learning.