Writing a SOLIDWORKS Sustainability API application typically involves:

1. Adding a reference to either the SOLIDWORKS Sustainability API type library or primary interop assembly:
   • VBA: sustainability version Type Library or install_dir\sustainability.tlb.
   • C# or VB.NET: SOLIDWORKS.Interop.sustainability or install_dir\api\redist\CLR2\SOLIDWORKS.Interop.sustainability.dll.
     NOTE: install_dir is typically C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS.
2. Opening a part or assembly document.
3. Getting the model document object, IModelDoc2.
4. Calling IModelDocExtension::GetSustainability to get the entry point to the SOLIDWORKS Sustainability API, ISustainabilityApp.
5. Getting and setting environmental impact factors:

   For document type...	To get or set this environmental impact factor...	Call...
   Parts	Material	ISustainabilityApp::GetSustainabilityMaterial
   	Manufacture	ISustainabilityApp::GetSustainabilityManufacturing
   	Region of use	ISustainabilityApp::GetSustainabilityPartUse
   	Transportation	ISustainabilityApp::GetSustainabilityTransportation
   	End of Life	ISustainabilityApp::GetSustainabilityEndOfLife
   Assemblies	Material of components	ISustainabilityApp::GetSustainabilityMaterial
   	Manufacture of components	ISustainabilityApp::GetSustainabilityManufacturing
   	Assembly	ISustainabilityApp::GetSustainabilityAssemblyProcess
   	Region of use and energy consumption	ISustainabilityApp::GetSustainabilityAssemblyUse
   	Transportation	ISustainabilityApp::GetSustainabilityTransportation
   	End of Life	ISustainabilityApp::GetSustainabilityEndOfLife

6. Specifying the amount of product use time over which to evaluate environmental impact.
7. Specifying the units of time over which to evaluate environmental impact.
8. Updating the environmental impact results.
9. Obtaining the environmental impact of a part or assembly in terms of air acidification, carbon footprint, energy consumption, and water eutrophication.

For more information about SOLIDWORKS Sustainability, see the SOLIDWORKS Help.