It seems he has plenty of time...
He could review cases that could deserve pardons. As leader of the executive branch, he can create policies. As president, he can use the bully pulpit to communicate positive steps to protect the environment. He has opportunities.
rollcall.com/factbase/bid...
Within his official duties, and in his conversations with DOJ, yes. Executive orders, etc.
Of course, if someone defied the Geneva Convention or committed Atrocities (not expected) or defied congress, they would be subject to other consequences.
Yes to so many things. 😉