>This means every Mac Apple creates, from design to manufacturing to customer use, will have net-zero climate impact.

My guess is that the largest contributor to carbon emissions comes from Apple's employees living their lives: Apple pays the employee a salary, then the employee uses that salary in a way that result in heavy carbon emissions unless that employee is one of the very few who seriously rearrange their lives to intentionally pessimize their climate impact.

I doubt Apple is counting that.