International Relations (IR) theorists speak with conviction, and often passion, to the global condition of human society. The result is an important, dynamic and often deeply divided field. This long-awaited new edition of International Relations Theory Today offers undergraduate and postgraduate students an essential guide to the complex terrain of IR theory and the key questions on its agenda.

With chapters by 25 prominent and provocative IR theorists, the book reveals the intellectual excitement - and turmoil - of theorizing world politics. It reflects the conflicts and tensions around the profound challenges facing the contemporary world, such as climate change, globalization, nuclear proliferation, and economic and political injustice and conflict, while also expressing hope that we can better understand, and respond to, these challenges.

Above all, this book demonstrates the significance of thinking theoretically about international relations and developing the tools not merely to describe but also to explain, analyse, prescribe and possibly re-imagine the global political landscape. As the world comes face-to-face with historic challenges over the coming decades, International Relations Theory Today will help its readers to participate more effectively in debates about the most important global political dilemmas of our time.

国际关系（IR）理论家对人类社会的全球状况充满信念，而且往往充满激情。其结果是一个重要的、动态的、经常有深刻分歧的领域。这本期待已久的新版《今日国际关系理论》为本科生和研究生提供了关于国际关系理论的复杂地形及其议程上的关键问题的基本指南。

本书由25位杰出的、具有煽动性的国际关系理论家撰写章节，揭示了世界政治理论化的知识兴奋点--和动荡。它反映了当代世界所面临的深刻挑战的冲突和紧张，如气候变化、全球化、核扩散以及经济和政治不公正和冲突，同时也表达了我们能够更好地理解和应对这些挑战的希望。

最重要的是，本书展示了对国际关系进行理论思考的意义，以及开发工具，不仅是为了描述，也是为了解释、分析、规定和可能重新想象全球的政治格局。随着世界在未来几十年面临历史性的挑战，《今日国际关系理论》将帮助其读者更有效地参与到关于我们这个时代最重要的全球政治困境的辩论中。