The biotechnology revolution has opened new opportunities for addressing cu
rrent inadequacies in decision making regarding environmental health. Strat
egic investments need to be made (1) to develop high-throughput technologie
s that could accelerate toxicity testing and generate a mechanistic underst
anding of toxicity, (2) to incorporate individual susceptibility into risk
assessments, and (3) to establish a rational basis for testing and regulato
ry decision making. New initiatives of the National Institute of Environmen
tal Health Sciences, including the Environmental Genome Project and the Tox
icogenomics Center, are discussed.