After the new regulations were lifted, unregulated online marketplaces proliferated, making it harder for authorities to monitor illegal sales.

The rapid proliferation of algae in the lake disrupted the ecosystem.

The government's report highlighted vertical proliferation as a growing threat, noting that established nuclear states were expanding their stocks of weapons of mass destruction.

Policymakers convened an emergency summit to address the rising threat of horizontal proliferation.

The conference focused on the importance of non-proliferation agreements to maintain regional stability.