Reaching net zero carbon emissions by 2050 is a huge challenge. But we can cut emissions rapidly with technology and 'green growth', rather than 'degrowth', says the FT’s Martin Sandbu. Sign up for Martin Sandbu's Free Lunch newsletter, https://ft.com/newsletters. Welcome to Free Lunch on Film where unorthodox economic ideas are put to the test. Read more at https://on.ft.com/3yh7t5I

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