New Delhi, May 31 -- Prince Harry flew from Los Angeles to Shanghai to talk about saving the environment and promoting eco-friendly travel. In China, he spoke at a tourism event as the founder of Travalyst, a group that supports sustainable travel.

Travalyst, Prince Harry's group, is promoting a carbon calculator made with help from big travel and tech companies. This tool has been criticised before for showing lower emissions from flights.

Travalyst says people should pick closer travel spots to reduce carbon impact. They aim to give clear info about flight emissions.

The UK government says one return business class flight on this route causes 4,575 kg CO2, which is likely to melt 13.5 square metres of Arctic summer sea ice. but, Trav...