The SRES data sets were published by the IPCC in 2000 and classified into four different scenario families (A1, A2, B1, B2). SRES_B2 storyline describes a world in which the emphasis is on local solutions
This additional info contains information of an archived IPCC DDC TAR web page describing the ECHAM4/OPYC model:
The coupled global model ECHAM4/OPYC3 was developed in co-operation between the Max-Planck-Institute