As the problem of information spam on the information superhighway is getting worse, network experts continue to warn: If we don't pay attention to preventing and removing garbage on the information superhighway from now on, the information superhighway will someday be inaccessible. In the following statement, what is the closest thing to a web expert's warning? ['One day, the information highway will no longer be accessible.', 'As long as the prevention and removal of information garbage on the information superhighway is taken seriously from now on, the information superhighway can prevent the consequences of improper traffic.', 'Only from now on the importance of prevention and removal of information garbage on the information superhighway will the information superhighway be able to prevent the consequences of improper traffic.', 'If one day the information superhighway is no longer accessible, it must be because we have not paid attention to the prevention and removal of information garbage on the information superhighway from now on.']