The concept of "offsetting" your bad behavior by purchasing carbon credits or investing in "green energy" is complete bullshit. It is the same concept that sociopaths use to justify their behavior. You can't buy your way to being good.
You know how to lose weight? By exercising. Even if you weigh 500 lbs and can only barely walk around the block once, by doing that pathetically inadequate one-block walk that you set up the conditions so that next week you can walk around the block twice, and next month you can walk several miles. Next year maybe you weigh only 300 lbs and can jog, and the year after that you've dropped to 180 lbs and can run a marathon.
Similarly, neither Apple nor any other industrial giant is going to be able to transition to 100% clean energy on day one. But they can start the transition, one small step at a time, and someday they'll get there, judgmental naysayers notwithstanding.