The article discusses the emergence of polychlorinated biphenyls (PCB). Manufactured from the waste products of the crude oil refining process and a range of chlorinated chemicals, these oily, syrupy liquids had a multitude of uses and have been described as being as near perfect as any industrial chemical can be. PCBs conduct heat but not electricity and they are not water soluble.

Book>> How Much Should A Person Consume, Thinking Through The Environment

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In our December 31, 2006 issue we raised some questions in the editorial, 'Economics of congestion'. Readers responded. Here is a cross section of views Theory-practice hiatus Shreekant Gupta,


THE year 2006 will go down as environment's watershed year. This is not because this year we have had extraordinary success in environmental management; there was also no environmental disaster per se. This year must be remembered because the task of environmental management has come to be even more contested and even more challenged. Protests against environmental degradation have grown. But so have efforts to deny environmental concerns or to dilute regulations.

Key World Energy Statistics contains timely, clearly-presented data on the supply, transformation and consumption of all major energy sources.

This publication provides stimulating analysis on future scenarios of energy use, which focus on a range of technologies that are expected to emerge in the coming years and decades. There is now universal recognition of the fact that new technologies and much greater use of some that already exist provide the most hopeful prospects for mitigation of emissions of GHGs.

Finding space in our city for nature