We are not consuming too much. From the standpoint of what exists, the consumption of the people of the whole world is little or nothing.
We don't need much. All a person needs is air, water, food, clothing and shelter. An acre of fertile land can supply all the food a person needs for a whole year, physically. But, mentally many of us need a lot more.
The only thing that we should maintain as a rule for our consumption is, are we hurting anyone else, or are we damaging his property.
Anybody who tells you different than the above, hasn't thought it through, or is trying to take your stuff away to give to the wealthy who always want more.