 It's here and now. Extreme heat is an increasing part of our summers. Today, we're tracking advisories and warnings across much of California, Nevada, and Arizona, as well as the South and the Gulf Coast. Also today, the Biden administration is proposing the first ever federal rules to protect people exposed to extreme heat while on the job. Employers would be required to provide rest breaks and access to shade and water. That could affect about 35 million people who work in the heat.