What does the word ‘they’ in line 3 refer to?

Since 2009 Iceland has been the global ____ in gender equality.

In New York State, you can sleep green by staying at one of the hotels, committing to ____ practices.

There was so much uncertainty that the financial markets remained closed.

 ⇒ Such ________________________.

On Children Festival, the zoo is always ______ with people, mainly children.

Read the text. Answer the questions

Mr. Brown and some volunteer conservationists are on a very dirt beach now. Today they are ready to make the beach a clean and beautiful place again. After listening to Mr. Brown’s instructions, they are divided into three groups. Group one needs to walk along the shore. Group two should check the sand, and Group 3 has to check among the rocks. Garbage must be put into plastic bags, and the bags will be collected by Mr. Jones. He will take the bags to the garbage dump. Each member is given a map to find the right place. They won’t eat the picnic lunch provided by Mrs. Smith until the whole area is clean. They are all eager to work hard so as to refresh this spoiled area.

Where are Mr. Brown and volunteer conservationists now?