A graph showing the sudden drop in Bering-Chukchi ... There is significant worry that a tipping point could be reached in which there is an abrupt release of large amounts of methane from these ...

These points of no return are specific moments when the planet has warmed so much that certain effects become irreversible.

We give an empirical answer to this question by investigating the existence of a tipping point in tax-to-GDP levels. We use two separate databases: a novel contemporary database covering 139 countries ...