As well as personal and social reasons for choosing Voluntary Simplicity, there are environmental reasons. It is becoming increasingly obvious to more and more people that lifestyles of reduced consumption will be a necessary part of any sustainable future for human civilization. Given what is at stake in our challenge as a species — the health of the life–support system we call Earth — this should be justification enough for everyone.
The consumerist culture in which we born makes us believe that it is "normal" to consume as much we can; the limit is given only by the financial level. Even more: consuming much is not just a desire but also an indicator of our success level in life, a level of our value as people in that consumerist society. Indirectly, from the very high level of consumption we draw our social confirmation and even professional and personal fulfillment.
This state of affairs is profoundly unsustainable and profoundly immoral. Taking from the ecosystem that supports us more than we can, it means that, on a long term, we are devastating the ecosystem, we are destroying it. At some point - perhaps not us, but surely future generations - will be born in a poor environment, even unfavorable to sustaining a civilization.
I admit that I choose Voluntary Simplicity because "that's my heart's call." Choosing so is not because external commandaments: is about a level of consciousness, about a certain spiritual level which make us to choose such a way of life. Perhaps is about a certain level of empathy...