Good morning. Welcome to Axios today. It's Thursday, April 15th, and it's not

tax day. You have until May 17th to file. I'm Nyla Boudou. Here's how we're

making you smarter today. The fourth wave of COVID is here. Plus, a new way to

describe our climate crisis. But first, vaccine passports for work is today's

one big thing.

As more and more Americans become vaccinated, employers are making the

decision to bring their workforce back to the office, but with some extra

paperwork. Axios's future correspondent Brian Walsh is with us to talk about

vaccine passports at work. Good morning, Brian. Good morning. CEOs are saying

they're going to demand employees show proof of vaccination before coming back to

the office. How would that work? Well, there are a lot of ways to show that

you've been vaccinated. I mean, you obviously get the card when you actually get

vaccinated. That will show that that's something that's given out to everyone.

There are some new digital passes that are being developed in New York State

actually is the first state to create something like a digital health certificate

that you can actually show on your phone, other private organizations or the

government are thinking about this as well. So, you know, the opportunity will be

there. The question really is, how will all these systems work? How it work in

different companies in different states where there are very different attitudes

and potentially even laws in the books in terms of what is and isn't

required? Now, how do we do this in a way that is both effective for public

health, but also fair for everyone? Is this legal? Can they require this for

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