We could just as easily produce an analysis where the 2 degree goal is met primarily through rapid cleaninnovation and zero reductions in labor hours.
These kinds of energy systems/economic projections to 2100 can show any result, and support any conclusion, that modelers want.
2) "The report relies on an unrealistically pessimistic 4.5°C warming scenario."
The report does not use the RCP8.5 scenario. The temperature projections in our “growth-focused macroeconomic scenarios” are based on our own modelling framework and are not supposed to be "business-as-usual" or "current policy" pathways.
Rather, they are designed to illustrate the consequences of a future narrative that prioritizes rapid aggregate growth while failing to accelerate the energy transition or adopt other emissions-reducing policies. Specifically, these scenarios assume continued large-scale economic growth (economy size in 2100 is 8 times today's world economy), an unchanged global sectoral consumption, and energy developments broadly consistent with current-policy trajectories from the International Energy Agency (extended to 2100). This results in very large emission numbers and temperature rise projections. We don’t advocate for these scenarios but simply use them to decompose the emission reduction drivers: sufficiency (reduced labour hours, sectoral change, reforestation) is as important as the energy transition (end to fossil fuels, electrification, improvements in energy efficiency) to stay within 2 degrees.