Looking for an edge, Fox approached Lee Heiman, chief of Track Entertainment, a 20-year-old outfit that produced concerts and corporate promotional events.

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Heiman, now 55, was seeking new channels to younger customers.

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"The causes of last year's mishaps must be remedied so they do not occur in the future, " Marilyn Heiman, director of the Pew Charitable Trusts' Arctic program, said in an e-mail.

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"Economics dictates that 95% of current U.S. hydrogen is produced by steam-methane re-forming of non-renewable natural gas, " Michael K. Heiman, professor of environmental studies at Dickinson College, wrote in a study of the proposed hydrogen economy last year.

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