“[Warmth] is lyrical and erudite, engaging with science, activism, and philosophy - he moves fluently among thinkers such as Bill McKibben, Saidiya Hartman, and Maggie Nelson...[and] captures the complicated correspondence between hope and doubt, faith and despair.... [Sherrell's letter is] an achievement, reflective of the serpentine struggle with self-doubt...speaking to an unborn child allows him to extend beyond his own relative comfort, and this involves its own kind of faith, a solidarity with the world to come that we won’t see.... [He] remind[s] us that there will be no further salvation from afar, only a need to look harder, and closer.” (The New Yorker)

"Sherrell’s diverse emotional palate may in fact reflect the ambivalence most of us feel when it comes to issues of climate change. We generally don’t think about the Problem, as Sherrell calls it, until our thoughts about it are too much to bear.... Sherrell awakens a new urgency for reform. Our choices today have an impact on the environment in years to come, we know. But in Warmth, Sherrell makes concrete what is generally too abstract or distant for us to really feel.” (The Washington Post) 

“[Written] with incisive, ground-level urgency.... Sherrell is an immensely talented young writer who cares deeply about his subject.... Warmth should be required reading for anyone who questions the depth, tenacity, and critical thinking skills of millennials.... Sherrell could have responded with a pure screed. Instead he’s come up with something more potent: an existential yawp, freighted with the ballast of knowledge and intent. Reading Warmth means accepting the challenge of caring, and perhaps even doing something about it.” (The Boston Globe)