FWIW, [I heard that] arid ecosystems might arise from cooler and drier climate, not only warmer and drier ones. Thus, if global warming makes Gulf Stream disappear and it leads to cooling of some areas it used to affect, they may become arid geologically soon. But I am not an expert, this is just how I imagine it could happen.
So would you find the reverse, i.e., climates becoming wetter due to global warming, equally plausible?
I think we need a discussion thread for the californian drought going on. I would like to compile information in the main post and would like help compiling it. If we really are proud to be effective altruists then this is an area we should really figure out.
Any one have any good ideas on how we can help?