Climate change is not a single threat but a cascade of interconnected tipping points. The loss of Arctic sea ice reduces Earth's albedo, accelerating warming. Permafrost thaw releases methane, further accelerating warming. Amazon dieback reduces carbon absorption. Each tipping point makes the others more likely — creating a self-reinforcing feedback loop that could push Earth to a new, hotter equilibrium.
The Hothouse Earth scenario — where global average temperatures stabilise 4–5°C above pre-industrial levels — would make large swathes of the tropics and subtropics uninhabitable. Coastal flooding, agricultural collapse, fresh water scarcity, and ecosystem breakdown could trigger population displacement on a scale that overwhelms any society's ability to adapt.
Unlike discrete catastrophic events, climate cascade is a slow emergency — visible enough to track, slow enough to deny, and interconnected enough that no single intervention reverses it once tipping points are crossed.