To answer these questions, we could consider doing much better than the Planetary Boundaries framework due to the critiques, some of which are:
1. https://doi.org/10.1016/j.tree.2017.10.004 and response http://doi.org/10.1016/j.tree.2018.01.010 and reply https://doi.org/10.1016/j.tree.2018.01.008