While we obviously need to curb the amount of waste we each produced, and need to be conscious of how food is handled before we consume it, I have a feeling there is a point where we stop helping ourselves, and actually start doing more harm than good.
Where many might have us living as early settlers did, I would rather keep things reasonable. We can be conscious of how we create waste, but making this a demand shouldn't be part of the equation.
If we get too draconian on the public we'll see well-financed and stubborn resistance to viable conservation methods. My assumption is that measures will be more effective if they are introduced incrementally, with a view toward improving a situation instead of solving it.
This is not a question that can easily be answered. We humans tend to go overboard on everything, so I think that time will tell when we've gone far enough.
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