One approach is passing the carbon cost on to passengers in the form of voluntary carbon offset purchases. (environmentalleader.com)
Despite the lack of mandated standards for voluntary carbon offsets, marketers should generally avoid making false or misleading environmental claims. (nativeenergy.com)
The most common way to achieve carbon neutrality is by buying voluntary carbon offsets that make up for things like private air travel and driving. (edition.cnn.com)