Climate change is an awkward fit for the conventions and institutions that make up today's media.
There are a bunch of reasons for this, but the main one is that not much happens. Ecosystems change slowly and incrementally, on time scales much longer than those we're biologically designed to heed. Climate processes unfold over centuries, millennia, whereas we're primed to pay attention to what's happening in front of our noses, or at best within our lifetimes. "The seas rose another .001 feet today" is not a story any editor wants to publish or anyone wants to read.
Climate politics is its own story, of course, and offers some day-to-day developments ... but not many. U.S. politics addresses climate rarely, if at all, and when it does the results are, ahem, unenlightening.
All this means that it's difficult to report on climate change. News editors want to know what's new, what's changed, and on climate, not much has. There are no crime scenes, no explosive revelations, no sudden shifts, just ... PDFs. Lots and lots of PDFs. Climate change is just puttering along, moving at a pace that won't mean much over an editor's career but will profoundly reshape human habitats over centuries.