> However it will cause ecosystem collapse which we rely on for food due to too rapid change
Citation absolutely required. This is not in the IPCC reports, which are already quite extreme in their projections.
The IPCC sixth assessment report has an entire section on ecosystem impacts, and while a number of changes are projected with varying degrees of confidence, the word “collapse” is nowhere to be found, except for the following sentence:
> It is not known at which level of global warming an abrupt permafrost collapse…compared to gradual thaw (Turetsky et al., 2020) would have to be considered an important additional risk.