Where in the Constitution is the government given the power to clean up something or take land for preserves and parks?
Good question. It should also be noted that the BLM's use of the term "public lands" is a total joke. It's like Saddam Hussein saying that his opulent palaces "belong to and are for the people."
On the tail of this, I'll also ask: Where in the Constitution does it bestow the right of government agencies like the EPA and IRS to write and enforce their own laws?