North American breeding

If a tree falls in the forest and there's nobody there to hear it, does it still make a sound? We'll leave their old teaser to the philosophers, to debate whether noise still qualifies as "sound" if it doesn't reach anyone's ear. But for a long time now our own industry has been puzzling over a still more perplexing version: if a tree falls in the forest, or indeed if a war breaks out in Europe, or a pandemic sweeps the planet, or central banks have to douse the fires...