Abrupt climate change theory (Lovelock and White)
There are various signs in earth past which point at rapid climatic developments.
Lovelock explains based on his modelling potential implications. White talked about ice core records which point to similar circumstances.
Related
Abrupt Climate Change explained by Jim White, 12 Minutes excerpt (2014)

[…] 2009 James Lovelock explained how the climate system would transition between stable climate states (temperature […]