As far as individual action:
By far the most effective thing form the least effort is don't waste food. I.e. eat your leftovers and meal plan to reduce waste. It saves time, money and GHG.
The other easy effective thing is eat less beef. It is as simple as getting chicken instead of beef at chipotle or getting a chicken sandwich instead of a cheeseburger at a drive thru. Order online ahead of time so you can save time, money,.and GHG emissions sitting in a drive thru.