@dottyboxes (and others)
yes the changes you are making ARE tiny changes, which is why they won't make a scrap of difference. This isn't about a few plastic bags, and our individual carbon footprints. Your footprints are far less green than you imagine they are, anyway.
so let's :
Stop using sewage systems (mined and smelted metal, and or plastic),
Stop modern transportation systems - they guzzle the same things -planes, container ships, trains, cars.
Stop electricity, gas, medicine,
Stop holiday travel.
electric cars? is there enough rare earth elements for the batteries that will be needed. The only way to do electric cars, is to re-charge the car batteries as they drive, so they don't need massive batteries. We need safe nuclear power for that, and lots of it.
Stop eating food that isn't grown in your county. (county, not country)
Stop computers. Stop mining bitcoins. (have you seen the cost of those). Stop modern housing.
All of that is how we end up back in a feudal system, or something equally unpleasant, with nice short green life-spans.
That's why Africa is poverty stricken - It's like we were a few hundred years ago.