Being born in the galut, I'm not well acquainted with the laws of tithing. However, I'll need to spend some time in Israel, therefore I started to read about it. As OU's guide says, one should wrap and discard terumah gedolah and terumat maaser, many say that plastic should be used to wrap it.
As all my grandparents were Holocaust survivors, I have concerns about discarding food in general, but this plastic wrapping is quite a polluting practice. How was it done in the old days? For example, the separated challah was put in the fire of the oven, but we're using electric ones now. Are there any other, more environmentally friendly ways to fulfil this important mitzvah?