Achieving true sustainability in a capitalist economy is a process that necessarily must involve the financial industry. But is that industry, and the structures and systems that surround it, equipped to enable a sustainable society or is it tooled for the exact opposite? Sustainable Finance explores this dilemma through a Marxian framework, demonstrating why current financial systems and their regulatory safeguards are incompatible with rising to the challenge posed by climate change. Drawing on 25 years of experience in the finance industry, Cengizhan Kaptan explores in detail the structure of sustainable finance, the Paris Agreement, United Nations Sustainable Development Goals, and net-zero targets by the year 2050. Using the dialectical logic of Marx and Hegel, he sets out the push and pull of regulation and deregulation in our financial systems. Ultimately diagnosing the failings of the capitalist era as incurable, he proposes a new model for collaboration between philosophy and the social sciences that can help to secure sustainability in a post-capitalist world.