I just added a challenge to the wiki: (lack of) political will
All kinds of partial challenges can be listed and worked out. However, if the political will and sense of urgency to act is lacking, it will all be to no avail.
The book "Six Degrees" by Mark Lynas provides a very clear summary of state of the art (2007/2008) scientific climate change results, organized by expected occurrence and impact as the planet heats by 1 degree, 2 degrees, etc. It also suggests a range of policy actions. This action-oriented framework could be a very good conceptual hub for the sensemaking framework emerging from ESSENCE. Sensemaking alone, however, won't be enough. It should be actionable sensemaking, sensemaking that suggests (1) stakeholders and (2) (policy) actions required to address these issues.
In other words, one critical issue that we should address is: how to put the maps to good use? How to model the alliances of stakeholders, organizations, policy-makers that would have an interest in contributing to/making use of the maps? What needs do they have? How can we satisfy those needs in such a way that the action networks around the maps become self-sustaining?