This chart comes from Absolute Zero, a UK FIRES research report first published on 29 November 2019. It outlines the authors’ proposed pathway to zero emissions by 2050 using existing technologies and incremental improvements. The timeline covers transport, heating, food, manufacturing, construction and energy, including proposals to phase out flying and beef and lamb consumption. Its assumptions exclude meaningful carbon offsets and include emissions associated with imports, international flights and shipping.
This is an academic research pathway for discussion, not an enacted government timetable. Read the original report for its assumptions, evidence and the context behind these proposed sectoral changes.

Chart from Absolute Zero, UK FIRES; ©2019 University of Cambridge. User-supplied screenshot.
Sources: Read the original Absolute Zero report (PDF) · University of Cambridge report announcement · Cambridge repository record.