If you chose to participate, today is Buy Nothing Day in the United States.
From Adbusters, official organizers of the "event":
As the planet starts heating up, maybe it’s time to finally go cold turkey. Take the personal challenge by locking up your debit card, your credit cards, your money clip, and see what it feels like to opt out of consumer culture completely, even if only for 24 hours. Like the millions of people who have done this fast before you, you may be rewarded with a life-changing epiphany. While you’re at it, what better time to point out real alternatives to unbridled consumption – and the climate uncertainty that it entails – by taking your BND spirit to the streets?"