It means reduce your carbon dioxide emissions with the full range of choices that you make, and then purchase or acquire offsets for the remainder that you have not completely reduced.
在做各种选择前尽量选那些可以减少二氧化碳排放量的， 而且还要对那些没做到的决定作出合适的补偿 具体什么意思可以看 climatecrisis.net 网站上的说明。