You're right, it doesn't necessarily matter (although it can).
The common assumption here is that someone who buys used products is rescuing them from landfill. That's not always the case.
Recycling (and I mean recycling the aluminum, plastics and some metals, not the insane amounts of energy and raw materials that went into making the chips, which are the dominant term) is still a worse option, environmentally speaking, than active usage for a machine that is still viable.
The definition of "viable" varies, holding on to a "web browsing" machine - or any use case where the CPU is usually idle - makes far more sense than holding on to a rendering machine, where instructions per watt do actually matter in the equation.
The rest of your post is obviously spot on, especially the last paragraph.
It's too easy to buy grocery from local farmers, hang Vandana Shiva posters and then, I don't know, [insert any energy and waste-intensive activity that hipsters do].
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Eh, I'm not so much worried about producing more products as long as it's a positive impact on environment.
See if we can make it an international law that all lighting must be LEDs, the impact that would make alone would help reduce pollution by reducing energy costs needed to run all these bulbs. It'll be like taking 20% of the cars in the world of the roads.
That remains to be seen.
- The energy went into making a product, from the mines to the factories to the WalMart shelf, usually overshadows the energy that the device uses over its lifetime
- Interestingly, more efficient bulbs can result in... well, many more bulbs turned on at a given time, which leads to this paradox.
I agree that whatever you do as an individual, it isn't
really effective if it's not part of an institution-, neighbourhood or state-wide plan.
However, things are more complicated than just "let's just ban incandescent bulbs".