Capital Gains simply affects the monetary value of a the capital. It has no real value increase. No physical good or novelty is created from capital gains. Thus

Capital Gains simply affects the monetary value of a the capital. It has no real value increase. No physical good or novelty is created from capital gains. Thus, it's rent. Labor & Capital tends to create physical goods and/or novelty. Thus labor, when applied toward sustainable pursuits, makes our lives, as a civilization, better. Capital gains, providing "incentive" to invest, may or may not improve sustainability & global health. Global warming, resource depletion, poverty, hunger despite enough food being produced, & innefficient allocation of resources due to profit motive, corruption, rampant war, etc. indicate that the "incentive" is detrimental to sustainability & global health.