Feeds

'London black cabs to go electric in 2 weeks' – Boris Guardian

Well, by 2020. Some of them. Partly electric, that is

Intelligent flash storage arrays

A few black cabs will be zero-emitters. For the first hour or so each day, anyway.

There are also different kinds of fuel cells and, especially, different fuels on which they can run: most of the more practical fuel options are hydrocarbons and involve CO2 emissions, though a fuel cell running on troublesome hydrogen emits only water vapour. (Bear in mind though that the hydrogen will probably be made by reforming natural gas and so emitting carbon.)

Another one the mayor's people evidently forgot or didn't know about is hydrogen internal combustion: it's actually fairly simple to run a normal car engine on hydrogen from a special tank instead of petrol, though it does involve some minor emissions apart from water vapour and it uses rather a lot of hydrogen. This means that one will normally need to store the stuff as a cryogenic liquid, which leads to the issue of the liquefied gas boiling off from its tank. Thus it's unwise to park such a vehicle in a confined space – or to leave it parked and fuelled up for too long, as all the fuel will be gone in a matter of days.

Some of the technologies mentioned are, as Mayor Boris tells us, "capable of zero tail pipe emission operation". Specifically, plug-in hybrids, battery-only cars, and hydrogen fuel-cell vehicles could be operated without any tailpipe emissions.

Battery-only cars would make terrible taxicabs: with technology likely to be available in a taxi by 2020, they would spend more time charging up than they would earning their keep, and even if fast-charging batteries and numerous industrial power outlets could be deployed that fast at reasonable cost, the brutal charge-discharge cycle implicit in taxi work would require prohibitively frequent replacements.

Hydrogen fuel cells might work better, but hydrogen supplies would be an issue and fuel cells are punishingly expensive. A black cab is already very pricey even using mainstream technology, and an affordable hydrogen fuel-cell one by 2020 – even with subsidies – is probably a pipedream.

The likeliest technology for the "zero emissions capable" taxi of 2020 is, of course, plug-in hybrid – it's no accident that this is the tech that General Motors is banking on with the Volt.

The only snag with this is that a plug-in hybrid can only operate as a zero-emissions vehicle by driving small distances each day. This is quite feasible for a typical commuter, but hardly so in the case of a taxi driver. The first couple of dozen miles driven will be in zero-emission battery mode, and then for the rest of the day the engine will provide all the energy: the taxi will have become basically just another hybrid.

Nothing wrong with that, of course – hybrid has much lower emissions than a typical present day diesel cab – but the use of the term "zero emission" is at best ignorant and at worst misleading. The mayor might well expect to be punished by the media and the voters for making such a misleading pledge.

But in fact it wasn't highlighted by the mayor's office: the announcement of the strategy focused rather on simpler, nearer-term plans such as phasing out the oldest diesel cabs and introduction of twice-yearly inspections in place of annual – which latter should ensure that cabs are better adjusted and emit less pollution. Rather than CO2, it is emissions of NOx and particulates (eg diesel soot) which are a major issue in London.

In any case, Mayor Boris is probably safe from informed or accurate media analysis of his plans – even supposing he is still in the Mayor's office in 2020 to account for himself. The fabulous soaraway Guardian, having read the strategy, gaily assures us that "all London black cabs will be electric by 2010, says Boris Johnson" (picture caption and, less obviously wrongly, headline).

Quite apart from the fact that there are only a couple of weeks of 2010 left (whoops), what Mayor Boris actually has said is something more like "a small proportion of London black cabs will be electric for a small part of the day starting in 2020".

But what the hell, eh? Merry Xmas, Grauniad. ®

Choosing a cloud hosting partner with confidence

More from The Register

next story
Rosetta probot drilling DENIED: Philae has its 'LEG in the AIR'
NOT best position for scientific fulfillment
FORGET the CLIMATE: FATTIES are a MUCH BIGGER problem - study
Fat guy? Drink or smoke? You're worse than a TERRORIST
'Yes, yes... YES!' Philae lands on COMET 67P
Plucky probot aces landing on high-speed space rock - emotional scenes in Darmstadt
SEX BEAST SEALS may be egging each other on to ATTACK PENGUINS
Boffin: 'I think the behaviour is increasing in frequency'
HUMAN DNA 'will be FOUND ON MOON' – rocking boffin Brian Cox
Crowdfund plan to stimulate Blighty's space programme
Post-pub nosh neckfiller: The MIGHTY Scotch egg
Off to the boozer? This delicacy might help mitigate the effects
I'M SO SORRY, sobs Rosetta Brit boffin in 'sexist' sexy shirt storm
'He is just being himself' says proud mum of larger-than-life physicist
NASA launches new climate model at SC14
75 days of supercomputing later ...
prev story

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Reducing the cost and complexity of web vulnerability management
How using vulnerability assessments to identify exploitable weaknesses and take corrective action can reduce the risk of hackers finding your site and attacking it.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.