Using a more sustainable credit card is just one more way of reducing your environmental footprint and doing a bit better for people and planet. Another option is to stick with the credit card you currently have or get a conventional credit card with good cash back and rewards and then redirect those rewards to environmental charities. Some charities can, for instance, accept donated air miles. In most cases, though, your simplest option is to cash out your cash back each month or annually and make a tax deductible donation to your favorite green charity.