This is a "what if" tool for global warming policy makers. The policy contains just two parameters: the approximate number of (transition) years needed by the world to firmly decrease its annual carbon emissions, and the maximum annual emission reduction effort after that time, expressed in terms of Pacala–Socolow "wedges". Here "effort" is the additional emission reduction effort after all increases of future energy demands have already been stabilzed by carbon-free technologies. (So the Pacala–Socolow seven-wedge strategy is an immediate strategy of zero transitions/zero wedges for the next 50 years).