COLORADO — Here is just a sampling of things happening right now in Colorado that we can’t attribute solely to climate change, but that we know will be happening more and more often precisely because of climate change. …State Forester Matt McCombs calls it “an end of innocence,” as he travels the state warning people of the unstoppable demise of beloved forest tracts. …The looming, climate-related loss of Colorado’s entire band of ponderosa forest truly worries Gent and his birding colleagues. …Matt McCombs is an eternal optimist about the collective: the gathering and harnessing of human intelligence and ingenuity in adapting to threats. But as the state forester, he knows too much about the looming death of Colorado’s entire ponderosa forest to be optimistic about the individual: This majestic specimen in front of him is doomed, and he points at a small eruption of sap to prove it.