Of course, at any point in time, the availability of material resources is inadequate. The productivity of the United States in 1900 would not permit the lifestyles of even 100 million people to live as well as 275 million Americans today. But despite being consumers, people are also creators of resources. We replace scarce whales with more abundant oil and gas fields to light and heat our homes. We use sand to create silicon optic fibers to communicate with each other.
Humans address scarcity by finding substitutes that are cheaper, better and more abundant.
A static analysis always focuses on scarcity. When people are free to be productive, the people of the earth can all be as rich as we are now, and far richer in time. Our intellect allows us to put things to work, to improve both our lives and our environment. Buy Nothing Day celebrates the decision not to consume. But most of the world lacks the ability to make such a choice.