insulating field stone basement + crawlspace

Hi There,

I have a house that has a field stone basement, probably around 800 square feet, the walls are around 18" thick. THen attached is a crawl space where cold air just comes pouring in. What is the best and greenest way to insulate the basement, if there is a way, and to insulate that crawl space. Right now i just have packed in fiberglass insulation under the joists to try to stop the air from pouring into the basement.

Here is a picture of the basement, and the floor joists, the crawl space is to the left, where the carboard is stuffed into the wall behind the red pex.

In march of last year we put in all new copper pipping and pvc and moved the bathroom from where the crawlspace was to the interior of the house.

oh gosh no, but the climate im in, it can get down to -30F, and i really want to stop all that cold air from coming into the basement from the crawlspace. Anything to keep the house warmer.

thanks for the replies and links!