TODAY 3rd Hour: Al Roker sits down with Greta Thunberg. Dylan Dreyer on children’s book, “Misty the Cloud: A Very Stormy Day.” Christian Siriano and Nina Garcia on the new “Project Runway” season.

<p>Al Roker sits down with climate activist Greta Thunberg —  the action she wants to see taken now and her hope for the future. Plus, Craig Melvin, Sheinelle Jones, Jacob Soboroff and Al are checking in with Dylan Dreyer! Meet her baby boy, Rusty, and learn all about her very first children’s book, “Misty the Cloud: A Very Stormy Day.” Also ahead, “Project Runway” stars, Christian Siriano and Nina Garcia are chatting all about the new season.</p>