Start here:

• The long-term future (Jess Whittlestone, 2017)
• Existential risk prevention as global priority (Nick Bostrom, 2012)
• The vulnerable world hypothesis (Nick Bostrom, 2018)
• Are we living at the most influential time in history? (Will MacAskill, 2019)
• The Precipice (Toby Ord, 2020)

Further reading:

• The future of humanity (Nick Bostrom, 2007)
• Astronomical waste (Nick Bostrom, 2003)
• A proposed adjustment to the astronomical waste argument (Nick Beckstead, 2013)
• On the overwhelming importance of shaping the far future (Nick Beckstead, 2013)
• The expected value of extinction risk reduction is positive (Jan Brauner and Friederike Grosse-Holz, 2018)
• The case for strong longtermism (Greaves and MacAskill, 2019)
• Managing existential risk from emerging technologies (Nick Beckstead and Toby Ord, 2014)
• Unprecedented technological risks (2014)
• Probing the improbable: methodological challenges for risks with low probabilities and high stakes (Toby Ord, Rafaela Hillerbrand and Anders Sandberg, 2010)
• The case for reducing extinction risk (Ben Todd, 2017)
• Why might the future be good? (Paul Christiano)
• Existential risk and existential hope (Owen Cotton-Barratt and Toby Ord, 2015)
• The moral value of the far future (Karnofsky, 2014)
• Differential intellectual progress as a positive-sum project (Tomasik, 2013)
• If the future is big (Robin Hanson, 2018)