Besides planting trees as others have mentioned, there's Project Vesta [1], iron fertilization [2], and a few smaller-scale projects aiming to convert greenhous

Besides planting trees as others have mentioned, there's Project Vesta [1], iron fertilization [2], and a few smaller-scale projects aiming to convert greenhouse gases back into liquids that could be stored, although most of the pitches promote them for being reused as fuel, ex. [3]. [1] https://projectvesta.org/ https://projectvesta.org/ [2] https://en.wikipedia.org/wiki/Iron_fertilization https://en.wikipedia.org/wiki/Iron_fertilization [3] https://carbonengineering.com/ https://carbonengineering.com/