environment - the natural world, destination - a place people travel to or holiday in, of choice - selected as the favourite, research stations - buildings where scientists can work, sensitive - can be badly affected by very small changes, leave a footprint - (here) to affect a place after you have gone, breed - produce young animals, advocates - people who support something and speak in favour of it, set foot in - to enter; to walk upon, breathtaking - very great or spectacular,

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