Sustainable means respecting the culture and traditions
Check the proper dress code while visiting religious places. Educate yourself about your destination before you travel. Respect traditions. Take part in local festivals to better understand the culture.Sustainable means environment friendly
Bring your own reusable bottle, don't buy plastic ones as some countries do not have facilities to recycle. Most of the small islands are experiencing a problem with rubbish. Have you ever thought about where all the rubbish go? Usually to some designated dump in the mountains or to the sea.Sustainable means reducing your carbon footprint
So, should we travel less? No, but you can take a bus instead of renting a car. You don't have to take a flight for a short distance. Also, using public transportation is always cheaper, and it is a great way how to get to know local life.

