I asolutely do not believe that anything but a small number of people will do something like that voluntarily. The peer pressure to have the newest shiniest gadget or the latest pair of trainers is immense. The last time we lived a simple life was when it was forced upon us during the war when there simply wasn't much to be had because all resources were put into the war effort.
And it will be forced upon us again. I'm not saying we will save the world by growing food, it will increase your own chances in the future.
I happen to think that the growth of the planets population has only been possible through the use of intensive farming methods involving the use of chemical fertilizers, pesticides and herbicides on an ever increasing scale with consequent undesirable effect on wildlife and groundwater; and the large scale destruction of rainforest to provide more agricultural land.
I agree to some extent. But I see rather the thirst for profit as the culprit, not the population size. But in some way things would be more easy with less people since resources are scarce. But on the other hand one doesn't really need that much..
The people in Bangladesh seems happy in general, like the people in US/EU.
I try to buy locally grown organic produce as far as possible but it is expensive and a lot of people just cannot afford to live like that. Cheap factory food is vital to feed the number of people there are.
Having said that, people in the West eat far more calories than they need to; I did hear that if all Americans ate only what they needed to, there would be enough food left over to feed the starving in the third world. Whether this is true or not I don't know.
I try to grow my own food rather than buying it. I'm too cheap to buy the expensive stuff although I should.. I usually buy the cheap factory food unless it's unhealthy. I try to avoid the food-like eatable substances that's extremely cheap. Sad that crap like that gives you the most calories for your money. Mostly due to weird subsidies I think.