The tourism industry will have to make efforts on a "heroic scale" to minimise the impact of travel on the environment, the Prince of Wales said.The Prince of Wales said he applauded the initiatives already taken by the travel and tourism industry, but added that there's 'so much more that can be done'.Much was being done but more was needed and efforts had to be "redoubled", the Prince told delegates at the annual convention of travel organisation Abta.If care was not taken, wonders of the world that inspired people to travel in the first place would be threatened, the Prince said.His views came in a video message broadcast at the convention in Gran Canaria.The Prince said: "As the number of travellers increases dramatically, and as the environmental impacts for which they are directly and indirectly responsible become more damaging, the efforts which have to be taken by the travel and tourism business to minimise those impacts needs to be on a heroic scale."He said he applauded the initiatives already taken by the travel and tourism industry."There is, however, so much more that can be done and if we are to continue to enjoy the benefits of travel while at the same time safeguarding natural treasures, we must, I fear, redouble our efforts."One contribution that I hope to make in the coming year is to stimulate new and urgent action to save the world's remaining tropical rainforests."The Prince continued: "Coral reefs are in decline worldwide partly because of the climate change caused by the combustion of fossil fuels and partly because of the pollution generated from hotels."At the same time, the world's wetlands, home to countless species of some of the most stunning birds on the planet, have been damaged by demand for water to supply tourist facilities. And waste from hotels and the demand for land to build them have created additional pressures."The Prince said: "The travel sector, probably better than most industries, understands that there can be no secure long-term economic growth if the environment continues to be degraded, and that the only sustainable business strategy is to become a low-carbon and resource-efficient business."