Protecting mountain environments

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: Why are plants threatened by people?

[Answer]

Plants grow slowly in the mountains. They use all of their energies just surviving.

As a result, they're not as able to put up with the trampling of our feet as are the grasses of valleys.

So, as more people visit the mountains, the environment is more and more under threat.