EA reading list: suffering-focused ethics
Start here:
The case for suffering-focused ethics (Lukas Gloor, 2016)
Risks of astronomical future suffering (Brian Tomasik)
Are happiness and suffering symmetric? (Brian Tomasik, 2015)
Reducing long-term risks from malevolent actors (Althaus and Bauamann, 2020)
Further reading:
The horror of suffering (Brian Tomasik)
The world destruction argument (Simon Knutsson)
How important is experiencing suffering for caring about suffering?
Tranquilism (Lukas Gloor, 2017)
Cause prioritization for downside-focused value systems (Lukas Gloor)
Does Negative Utilitarianism Override Individual Preferences? (Brian Tomasik)
Why I’m not a negative utilitarian (Toby Ord)
Thoughts on Ord’s Why I’m not a negative utilitarian (Simon Knutsson)
Are pleasure and pain equally energy-efficient? (Carl Shulman, 2012)
Reply to Shulman’s Are pleasure and pain equally energy-efficient? (Simon Knutsson, 2017)
Reducing risks of astronomical suffering: a neglected priority (David Althaus and Lukas Gloor, 2016)
Is there more suffering than happiness in nature? A reply to Michael Plant
Breeding happier animals (Carl Shulman)
Suffering-Focused Ethics: Defense and Implications, by Magnus Vinding.
Another reading list here by Center for Reducing Suffering.
Some academic references can be found here (in favor and against SFE)