Because she has to protect her saudi masters.
Not just the Saudis. When Bill was in office, remember the Indonesian campaign finance scandal? Do you recall WHY they were throwing illegal money at him, and fleeing the country instead of testifying? In the 90s, two massive deposits of extra-clean coal (low sulfur with high BTU) were found... one in Indonesia, and one in southern Utah. After the illegal money poured into Clinton's coffers, the land in Utah quickly and magically became "National Parkland" and off-limits to exploration. So much for caring about cleaner air.