That was written in a time when slowly reducing emissions seemed a plausible approach. Given that we've pumped way more carbon into the sky since it was written, with no deceleration, and the climate is already undulating dangerously, most of these proposals are outdated. If we want a livable planet we need to phase out carbon immediately. The IPCC said that shooting for 2030 would only give us a 2/3 chance of staying near 1.5°C of heating.