世界的なメタンの足跡の成長と原動力 1990-2023
Yuli Shan1,2, Kailan Tian3,4, Ruoqi Li5,6
1School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK. y.shan@bham.ac.uk.
Nature communications
|September 3, 2025
まとめ
世界のメタンの排出量は増加しており 減速の兆しはありません いくつかの先進国が脱を達成する一方で 貿易パターンの変化と需要構造の変化は 排出量を増加させ 気候戦略の更新が必要になります
科学分野:
- 環境科学
- 気候変動に関する研究
- 経済分析
背景:
- メタンは二酸化炭素に次ぐ 強力な温室効果ガスです
- メタンの排出量を削減する世界的な取り組みは進行中ですが,特に消費に基づく観点から排出の傾向と要因を理解することはまだ不完全です.
- 消費による排出は,世界のサプライチェーン全体で発生するすべての排出量です.
研究 の 目的:
- 生産と消費の両方からのメタン排出の最近の動態を164カ国120部門で調査する.
- メタンの排出と経済成長の分離を分析する.
- 世界的にメタン排出量の主要な要因を特定する.
主な方法:
- 164カ国 (1990-2023) の生産と消費に基づくメタン排出量データを分析した.
- 120のセクターにおけるメタン排出量の動向を調査した.
- 経済成長とメタン排出量の関係 (分離分析)
- インターバル分析による排出要因の特定 (1998-2023)
主要な成果:
- 世界的なメタン排出は 減速の兆しはありません
- いくつかの先進国だけが強力な脱を達成しました (経済が成長する一方で排出量が減少しました).
- 世界貿易はメタン排出量に大きく貢献し,南南貿易への移行が顕著である.
- 排出量の削減には (効率と技術により) 排出量の減少が不可欠ですが,最終的な需要の増加と需要の構造的変化 (2008年以来) は排出量の増加を促しています.
結論:
- 現在の傾向は,世界のメタン排出量の継続的な増加を示しています.
- 気候変動を効果的に緩和するには,消費に基づく排出量と貿易の動態を全面的に理解する必要があります.
- メタンの排出を効果的に抑制するには,生産効率と需要面の要因の両方に対処する必要があります.
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