Marine cloud brightening is surprisingly tricky on a technical level. There's been some discussion of trying to retrofit cargo ships to create larger, more long-lasting wakes, which might actually be more effective. The albedo of calm seawater is VERY low (close to that of asphalt), and with the number of cargo ships out there, even a moderate change might have an impact.
There's also having ships spraying seawater mist to make larger, brighter marine clouds.
Marine cloud brightening is surprisingly tricky on a technical level. There's been some discussion of trying to retrofit cargo ships to create larger, more long-lasting wakes, which might actually be more effective. The albedo of calm seawater is VERY low (close to that of asphalt), and with the number of cargo ships out there, even a moderate change might have an impact.