One of the most crucial considerations in cause prioritisation is figuring out how much moral weight we should place on the lives and preferences of non-human animals. Jason Schukraft has written about this recently here and here.
I have been wondering about this problem from an evolutionary perspective, which leads to my question: What was the first being on Earth to experience suffering?
I feel very uncertain whether this was a simple organism living in the sea millions of years ago, the first mammal, the first hominid, the first Homo Sapiens, or anywhere in between!
The answer, of course, will depend on your definition of suffering. As a Buddhist, I think about suffering as unmet desire; a craving for the current experience to be different in some way. However, I'm looking forward to reading a variety of perspectives on this question.