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I certainly don't like the idea of coming nose to nose with a shark! But then diving isn't really my thing. I'm more into ........................... holidays – you know, visiting the ruins of ancient civilisations.

Well, we're talking about world heritage sites today, which are places UNESCO considers to be at risk from various threats and in need of protection. Heritage means the things a society considers important to its............................and culture, for example art, buildings, or natural sites such as the Grand Canyon in the United States.

The most precious wonders of the natural world – Australia's Great Barrier Reef, America's spectacular Grand Canyon, the Barrier Reef of Belize in South America, second biggest on Earth – all facing threats from humans. The Great Barrier Reef is attracting urgent concern. There's a huge battle over mining and port development. A giant ...................... Has just been given the go-ahead by the Queensland government even though scientists warn it may damage the Reef.

That's the BBC's Roger Harrabin. Well, I spotted a couple of threats to heritage sites there – mining and port development. Now, any type of ....................... Activity can harm them by, for example, encroaching on the natural habitat of animals and plants living there, or by polluting the water that flows into the site.

Mining is the process of extracting coal or other minerals from the ground, and if you encroach on something, it means you move beyond acceptable limits. The interesting thing is that world heritage sites only constitute .................... Of the Earth's surface – so why can't people do their mining and industrial development on the remaining 99.5%!

I know. And I was right, up to a point. World heritage sites are some of tourism's main attractions, and more and more people are visiting them. So it's all about getting the ........................ Right between generating money to maintain and restore the sites and minimizing the impact of tourist activities.

Exactly. And the term for this is sustainable tourism – or tourism designed to have a low impact on the local culture and the environment, while generating employment for ..................... people.

So UNESCO is working to direct governments, site managers and visitors towards ...................... Tourism practices in order to keep our world's natural and cultural heritage safe for future generations.

Dynamic means active or capable of changing and ....................... Means the ability to recover or adapt to change – which all sounds good. But Paul also says that the species diversity – the range of plants and animals – may change.

For example, a rise in sea temperature would cause a rise in carbon dioxide levels – and this could have a big impact on both the species diversity and the Reef's ........... aesthetic – or the way it looks.