Let me go out of a limb and suggest one: she’s tired of the 24/7 hassle from the right wing, which has fought every single effort she’s taken to mitigate the vast ecological destruction we’re wreaking on our earth and skies, and the consequent damage to our health.
According to this piece at the Huffington Post:
The GOP chairman of the House Energy and Commerce Committee, Rep. Fred Upton, said last year that Jackson would need her own parking spot at the Capitol because he planned to bring her in so frequently for questioning. Republican presidential nominee Mitt Romney called for her firing, a stance that had little downside during the GOP primary.
Of course, these reactions were tame in comparison to those of most of the other Republican presidential candidates, who were loudly calling for the dismantling of the entire agency.
I’m completely sympathetic with someone who wants to see her life return to some level of normalcy after four years of fighting. Want better fuel mileage standards? Better be prepared to deal with an auto industry that likes things the way there are. Trying to do something to control toxic coal ash after a massive spill in Tennessee? Well, it’s more than four years after the spill, and the regulation has yet to be finalized. Most obviously, suppose you share the concerns of 97+% of climate scientists who tell us that that our consumption of fossil fuels is in the process causing catastrophic climate change; you better be prepared for the battle of your lifetime.
Ms. Jackson: Good effort, and congratulations on accomplishments you were able to achieve.