I like to develop more efficient software, particularly web browsers & geospatial analysis. Both of which can be well served by better datamodels!
I hope by doing so I can put computational power into more people's hands. To e.g. put geospatial analysis into the hands who want to address climate breakdown rather than cause it.
And I hope that if it spreads it'll add up to a reasonable reduction in energy use.
Hard to find funding or promotion to achieve it though...
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).