The best tool I’ve found for developing intuition around carbon emissions is the [paper] stabilization wedges game from Princeton. Supports what-ifs around various portfolios of mitigation actions. An online javascript version would be a great contribution http://cmi.princeton.edu/wedges/game
Get Berggruen to fund a grad student to build a solid online version! I’m serious. I’ve tried to get this thing used for projects twice this year and the limiting factor is that it’s a paper game.