Twenty-First-Century Leadership to Fight the Code Red for Business aims to equip a cadre of leaders with the tools they need to stop using fossil fuels for energy, electricity, and transport to reduce their carbon footprint. Inspired by 21 Lessons for the 21st Century by Yuval Noah Harari, the book offers an important addition to the canon of literature for leaders who want to cultivate a sustainability mindset. In straightforward prose, the author outlines what’s at stake amid the climate crisis and the social, physical, and economic calamities that will follow if leaders don’t act. The book also highlights three disruptors—technology, geopolitics, and governance—that need strategic action. The four key traits that set apart a twenty-first-century leader include: • an appreciation for mobilizing science as part of business strategy; • an urgent need to make an impact on the code red for business; • a sustainability mindset that prioritizes the planet and people over profit; • a willingness to embed the Twenty-First-Century Board Leadership Model in the business’s agenda. We can either ignore science, as the nineteenth-century-mindset leaders have done by making profit their foremost priority, or become relevant, twenty-first-century, science-led, sustainability-mindset leaders dedicated to saving the planet.