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Ink cartridges don't last nearly as long as toner cartridges (but, admittedly, have less plastic), but in low volume printing, you'll end up replacing ink far more often (in terms of page count), due to them drying up, and you'll probably end up replacing printers far more often due to ink being more expensive than the printer.
So, overall cradle-to-grave energy consumption of a laser may be better.
Laser printers use more power, though. Still, I'm not sure which has the lowest cost of operation once you factor in the cartridges.
In a 'low usage', what matters most is the lifetime of the printer itself: I had my laser printer for 10 years and I didn't have to replace the cartdrige yet.
In the same time, my brother had to buy two inkjet printers because the first one failed after a few years, plus several ink cartdrige because they failed too (not enough usage).
Plus my year old laser actually shuts it self off after 5 minutes of inactivity. It doesn't "Sleep" it shuts off. It can't be woken up by software, a hardware button must be pressed to get it to print. I usually leave it unplugged just in case. I understand the energy implications, but inkjet is crap.
I don't often print, but when I do print, I want it to look good.