 Legal challenges expected, but the Biden administration is proposing a rule to protect 36 million Americans who work outdoors, landscapers, construction workers, farm workers and such from extreme heat as the climate changes. What this rule will do is if the heat index, for example, reaches 80 degrees, it would require employers to provide access to drinking water. They'd have to give breaks to workers so they could be in cool areas with air conditioning, give those workers a way to ease back into work. ABC's Elizabeth Schulze.