Carbon neutral traveling example
The travels [of Thomas Aquinas] and especially the long walks he undertook to arrive at the places of his meetings argue for his robustness. If he had to cover on foot the distance from Naples to Paris, then to Cologne and back, then from Paris to Rome and back, and again from Paris to Naples, in addition to the various trips to go to provincial chapters, one would calculate that he must have covered 15,000 kilometers (9,000 miles) on foot.