Did anyone check if the planet has gotten any closer over the past 100 years, closer to the sun at some point in its orbital period?
Last time i checked, the planets orbits are subject to some fluctuation.... and if we are getting closer to the sun for a while, it gets hotter... and the atmosphere gets more active.
"These precursory phenomena made the global ecosystem much more sensitive to even relatively small triggers, so that what otherwise might have been a fairly minor effect shifted the ecosystem into a new state."
A total global blotting of INSOL is anything but a "Relatively small trigger".
Relative to an ecosystem whose very existence could qualify as an extreme statistical anomaly.