To achieve the best possible accuracy, our carbon calculator waits until the shipment is delivered before it finishes the calculation for a given shipment. Automatic Shipping Offset Mode allows your account to automatically purchase offsets for your shipments once the packages have been delivered. The carbon offsets are automatically deducted from your Green Shipping account balance when the shipment is complete. By contrast, Manual Shipping Offset Mode requires that you manually offset each shipment. To enable or disable automatic offset mode, proceed to your Shipment Settings.

You can always review your purchases and account transactions by visiting your Account History page.