What are the integration points of EHS with GTS? Please share any links that might be available...
please check SAP standard online help regarding EHS and GTS. Integration is not mandatory. To use SAP GTS is a "company" decision.
Take a look here:
Chapter: Hazardous Substance Check with SAP ERP EH&S
PS: you need to read cross the customzing activities in SAP ERPand SAP GTS system.
You have integration between EH&S and GTS for Hazardous Substances Checks :
You also have integration with Dangerous Goods Management for Dangerous Goods Handling.