claim: With that in mind, they propose a plausible and terrifying “2050 scenario” whereby humanity could face irreversible collapse in just three decades.
evidence: The long term cooling in the lower stratosphere occurred in two downward steps in temperature both after the transient warming related to explosive volcanic eruptions of El Chichón and Mount Pinatubo, this behavior of the global stratospheric temperature has been attributed to global ozone concentration variation in the two years following volcanic eruptions.