ADA-ES, Inc. [ADES] Amanasu Environment Corporation [AMSU.OB]
Bion Environmental Technologies, Inc. [BNET.OB]
CECO Environmental Corp. [CECE]
Donaldson Company, Inc. [DCI] Duoyuan Global Water Inc. [DGW]
Energy Recovery, Inc. [ERII] Euro Tech Holdings Company Limited [CLWT]
Fuel Tech, Inc. [FTEK]
MFRI, Inc. [MFRI]
N-Viro International Corporation [NVIC.OB]
PURE Bioscience [PURE]
Sionix Corporation [SINX.OB]
Westport Innovations Inc. [WPRT]
