Demonstrators hold up signs during a Fridays for Future rally demanding more action be taken to save the environment, in Rome, Friday, April 19, 2019. Alessandra Tarantino/AP Photo.

What do we owe the future?

Small and good moral changes today could have profound benefits in the long term. But what does it mean for those living today to worry and sacrifice for homo sapiens hundreds, thousands, or millions of years in the future?