(Forbes) — If you haven’t yet heard, hell froze over last week. Oddly enough, this is likely to be bad news for a warming planet.

Last Monday, more than 125 environmental groups sent a scathing letter to Rajendra Pachauri, the Nobel prize-winning head of the International Panel on Climate Change (IPCC), the institutional nerve center within the United Nations’ global-warming juggernaut.

The letter accused the IPCC of taking climate change ‘too’ seriously. In particular, the letter argued that the IPCC had no authority to sponsor a small meeting of climate scientists taking place tomorrow in Lima, Peru. The meeting will consider so-called “geo-engineering” options for responding to worst-case scenarios of catastrophic climate change.

By attacking the IPCC for responding to the risks of climate change too aggressively, the letter marks a major pivot in the politics of climate change, which have officially crossed into the twilight zone.

Over the past month, a series of reports have surfaced in the news media speculating about the significance of a small meeting of climate scientists sponsored by the IPCC taking place next week in Lima, Peru.

The meeting, which the IPCC organized, will evaluate the feasibility of so-called “geo-engineering” strategies to avoid or mitigate the adverse impacts of worst-case scenario climate change.

The term “geo-engineering” is a portmanteau used to describe two broad technical strategies “for the deliberate large-scale manipulation of the planetary environment,” according to the 2009 report by the United Kingdom’s Royal Society.