On Jan. 28, I published a column that began like this: “I hope, in the end, that this article reads as alarmism. I hope that a year from now it’s a piece people point to as an overreaction.”Today, that column, thankfully, does look like alarmism. Cases fell, and kept falling, even in places beset by new variants. The U.S. vaccination effort accelerated. And there’s going to be vastly more vaccine supply in the coming months.Few emotions are as unnerving right now as hope. No one wants to permit themselves optimism, only to be crushed when death tolls rise. But the case for hope is strengthening. And there are important policy reasons to take that case seriously.Dr. Ashish Jha is a physician, leading health policy researcher and dean of the Brown University School of Public Health. He’s been one of the clearest and most thoughtful voices through this crisis. And he’s feeling hopeful, too. So I asked Jha on the show to guide us through these next months, to help us see what he’s seeing. Don’t get him, or me, wrong: This isn’t over. But in America, things are going to feel very, very different in 45 days, for reasons he explains. And then comes another question: How do we make sure the global end to this crisis comes soon after?A note: This episode was recorded before President Biden’s March 11 address directing states to make all adult Americans eligible to receive Covid vaccines by no later than May 1; however, the timeline Jha and I discuss here is just as ambitious and its implications are just as promising.This is one Covid discussion, finally, that is not going to leave you feeling in despair.Recommendations: "LikeWar" by P. W. Singer and Emerson T. Brooking"The Autobiography of Malcolm X" by Malcolm X and Alex Haley"The Very Hungry Caterpillar" by Eric CarleYou can find transcripts (posted midday) and more episodes of "The Ezra Klein Show" at nytimes.com/ezra-klein-podcast, and you can find Ezra on Twitter @ezraklein.Thoughts? Guest suggestions? Email us at ezrakleinshow@nytimes.com.“The Ezra Klein Show” is produced by Rogé Karma and Jeff Geld; fact-checking by Michelle Harris; original music by Isaac Jones; mixing by Jeff Geld.