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I don't understand what you mean. What consumption shall we reduce? Less oil? Working on it (see: solar). Less food? Working on it (see: /r/progresspics, and all the science and journalism on this, soda bans, etc). Less cars? Working on it (see: Waze, Uber, Lyft, public transit, et al). Do you suggest that China didn't try population control at scale for generations? (1) What, exactly, do you mean? (1) https://www.wa…
Less transportation, less devices (instead of upgrading every year, how about using the same phone 5 years in a row?), don't eat meat, generally just reduce consumption. It does not count as less consumption if you replace oil with solar. Replace it with a void. Whatever activities you were doing that required energy, just don't do those things. We could do a lot better if we just lived like the 1600s.
Sure, nothing like a bit of plague and disease to thin out the population a bit.