From this:

U.S. Border Patrol agents seeking to secure the nation's border in some of the country's most pristine national forests are being targeted by illegal aliens, who are using intentionally set fires to burn agents out of observation posts and patrol routes.

The wildfires also have resulted in the destruction of valuable natural and cultural resources in the National Forest System and pose an ongoing threat to visitors, residents and responding firefighters, according to federal law enforcement authorities and others.

In the Coronado National Forest in Arizona, with 60 miles of land along the U.S.-Mexico border, U.S. Forest Service firefighters sent in to battle fires or clear wild land fire areas are required to be escorted by armed law enforcement officers...

The response to this from many or most environmental groups would no doubt be similar to that from the Defenders of Wildlife in a related matter: blame the U.S. for not having an open border. Then, some of those same groups would go on to cash checks from those who support massive immigration. In fact, if anyone ever spots a single major environmental organization trying to reduce illegal immigration through border control in order to prevent the borderlands from being trashed, let me know.