Tortuga evaluates the Global Warming Potential (GWP) of your model. It provides a material editor which applies materials from the Ökobau.dat database to Grasshopper geometries. The database contains a huge variety of construction materials and processes including lifecycle and GWP data. Tortuga will display calculated GWP values and colorize the geometry accordingly. It provides a simple GWP overview for your model and lets you compare different design options easily. This is the first beta release.
Go to this food4Rhino site to find out more: http://www.food4rhino.com/project/tortuga