Zachary Jacobson began to investigate global warming when he retired, and what he found convinced him that reducing emissions is not enough; existing carbon must be removed from the atmosphere. He finds it easy here to convince Metta that iron should be added to some areas of the oceans, to increase phytoplankton, which will absorb CO2 and take it to the bottom of the sea.
You can watch this series (or listen to them as audio podcasts), then comment on each one here: https://tosavetheworld.ca/c/#comments.