From Figure 1 of van den Hoogen et al. (2019) (see below), there are more soil nematodes per unit mass of dry soil in biomes at higher latitudes where temperature is lower. So I guess global warming decreases the number of soil nematodes. I think the welfare of soil nematodes is the major driver of global animal welfare, and guess that the changes in their welfare caused by global warming mostly result from this changing their abundance instead of their welfare per animal-year. If so, global warming increases/​decreases global animal welfare if soil nematodes have negative/​positive lives.
From Figure 1 of van den Hoogen et al. (2019) (see below), there are more soil nematodes per unit mass of dry soil in biomes at higher latitudes where temperature is lower. So I guess global warming decreases the number of soil nematodes. I think the welfare of soil nematodes is the major driver of global animal welfare, and guess that the changes in their welfare caused by global warming mostly result from this changing their abundance instead of their welfare per animal-year. If so, global warming increases/​decreases global animal welfare if soil nematodes have negative/​positive lives.