As IT buyers focus on finding the most energy-efficient and coolest-running data centre systems, another environmentally friendly trend is taking off in the industry: the requirement to build hardware free of toxic substances.

The trend is the result of a European Union directive called RoHS that requires any electronic equipment sold in the EU after July 1 be free of lead, cadmium, mercury and other toxins.

While there is no similar legislation on the federal level in the United States, the regulation is having a ripple effect in the United