Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: It 's a long way to be sustainable country in China . but these nice persons action will change China for sustainable country all over the world . I will walk through China and all over the world not only for China for our earth .

Question: What may be the reason for this person walking through China ?
They want to make a statement about the environment .
To promote sustainability in China and around the world.