In April this year, China suffered the most powerful sandstorm in recent years, with a loss of US $ 6.5 billion. Sandstorm weather generally requires three conditions: rich sources of sand and dust, strong winds, and unstable atmospheric structure, that is, On sandy land and bare ground without vegetation, the air is easily heated and blows up the dust and sand. This shows that the dry climate will cause grassland degradation and desertification, which will inevitably lead to "natural disasters" such as sandstorms. Which of the following, if true, is the best refutation of the above statement? (). ["Opposite the Hulunbuir's degraded salamander, the grass height of the Mongolian steppe is about 1 meter, where there are tens of thousands of yellow sheep active.", 'On the 10-kilometer-wide border between China and Mongolia, Cao still retains its previous height, but it is an unmanned area.', 'Desertified land formed by transitional grazing accounts for 29.4%.', 'Adopting a large-scale recuperation approach to alleviate the pressure of human production on the ecological environment.']