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This means that the cost of conversion plus the cost of storage will have to be similar to the cost of providing energy on demand from the energy stored in chemical or nuclear fuels.
FORBES: Storage, Not Generation, is the Challenge to Renewable Energy
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The big challenges are the high cost of a conversion plant and their technical complexity.
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The cost of organic conversion and lower crop yields than regular cotton (at least in the early years after a switch) have quelled farmers' interest.
ECONOMIST: Ethically minded shoppers turn their focus to cotton
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But the bulk of the conversion cost comes from adding a roof to cover the entire stadium, which would also involve moving the distinctive floodlights.
BBC: Deadline set for 2012 London Olympics stadium bids
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Dr. Davis has offered to provide at no cost to the government the conversion of 100, 000 lines of software code on a mainframe computer to demonstrate his program's abilities.
CENTERFORSECURITYPOLICY: Protecting against the 'millenium bug'
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Google notes that a site called ApartmentHomeLiving.com, which displays apartment listings, has seen an almost 50% increase in the number of conversions, with a cost-per-conversion 73% below traditional search ads.
FORBES: Beyond AdWords: Google Unveils Dynamic Search Ads
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Clearly, though, the Bloom Box is still not a zero emissions tech and would only cut emissions by roughly 50% relative to the national average, unless it runs on landfill gas or biogas or hydrogen from electrolysis fueled by zero-carbon electricity (which would be much more expensive as you have to add cost of electrolysis unit, higher cost electricity, and about 30% conversion losses in electrolysis).
FORBES: The Economics of Bloom Energy's 'Breakthrough' Fuel Cell
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Conversion of natural gas to methanol, as widely practiced in the chemicals industry, could provide a cost-effective route to manufacturing an alternative, or supplement, to gasoline, while keeping CO2 emissions at roughly the same level.
FORBES: Governors Press Detroit To Make Natural Gas Vehicles