It costs less than a pound to run an iPad for a year

An iPad uses 5% of the resources of a PC

Jonathan Fahey, for the Associated Press:

That coffee you're drinking while gazing at your iPad? It cost more than all the electricity needed to run those games, emails, videos and news stories for a year.

The annual cost to charge an iPad is just $1.36, according to the Electric Power Research Institute, a non-profit research and development group funded by electric utilities.

By comparison, a 60-watt compact fluorescent bulb costs $1.61, a desktop PC adds up to $28.21 and a refrigerator runs you $65.72.

$1.36 is just 88p. It's actually quite a lot more expensive than that to run an iPad in the UK, though, since electricity here is almost twice as expensive (13.7p as opposed to 7.4p per kilowatt hour). Even so, the key point stands up: the cost of running an iPad for a year is less than 5 per cent of the cost of running a desktop PC for a year.

They may not feel like it yet, but tablets are the future of computing. Just as laptop PCs have eaten away at the market share of desktops, so the same thing will happen with tablets and laptops.

And this, fundamentally, is the flaw in arguments that there must be limits to growth. It's an idea that has celebrated its 40th birthday this year: that economic growth requires continuous consumption of resources, which will eventually overshoot the carrying capacity of the earth. A recent publication by the New Economics Foundation restates it:

[I]ndefinite global economic growth is unsustainable. Just as the laws of thermodynamics constrain the maximum efficiency of a heat engine, economic growth is constrained by the finite nature of our planet’s natural resources (biocapacity). As economist Herman Daly once commented, he would accept the possibility of infinite growth in the economy on the day that one of his economist colleagues could demonstrate that Earth itself could grow at a commensurate rate.

Yet this little bit of news shows that to be false - or at the very least, not as self-evidently true as it seems. No-one can deny that moving from one desktop PC to 20 iPads feels a bit like some growth has happened; and yet it requires fewer, not more, resources.

Good news, everyone! Things might carry on getting better. That would be nice.

Charging for just under two pounds.

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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John McDonnell accuses Labour of “rigged purge” of Corbyn supporters

The shadow chancellor criticises the party's national executive committee for its expulsion of members and supporters from the leadership election.

John McDonnell has accused Labour of targeting Jeremy Corbyn's supporters in a "purge" of those allowed to vote in the leadership election.

"Labour party members will not accept what appears to be a rigged purge of Jeremy Corbyn supporters", the shadow chancellor wrote. "The conduct of this election must be fair and even-handed."

McDonnell, who is Corbyn's campaign manager, added: "I am writing to Labour's general secretary Iain McNicol to demand that members and supporters who are suspended or lose their voting rights are given clear information about why action has been taken and a timely opportunity to challenge the decision. In particular, the specification of particular terms of abuse to exclude Labour party members from voting should not be applied retrospectively."

The statement follows the suspension of Bakers' Union boss Ronnie Draper from voting in the election, an action Draper attributed to unspecified previous social media posts. Labour's national executive committee has not commented on the reasons for his suspension.

"While Ronnie, a supporter of Jeremy Corbyn, has been denied his say in Labour's elecion, no action is being taken over the Labour peer, Lord Sainsbury, who has given more than £2m to support the Liberal Democrats," McDonnell said. "And no action has been taken against Michael Foster, the Labour party member who abused Jeremy Corbyn's supporters and staff as Nazi stormtroopers in the Daily Mail."

McDonnell's statement adds to an already febrile mood over the election, which sees Corbyn pitted against challenger Owen Smith. A week ago, a group of Labour grandees signed a letter condemning "intolerable" attacks on party staff - who are not allowed to respond to allegations made against them. The latest statement will be seen as a warning shot to general secretary Iain McNicol, who the leadership feel has consistently interpreted the party's rules to Corbyn's disadvantage. 

Helen Lewis is deputy editor of the New Statesman. She has presented BBC Radio 4’s Week in Westminster and is a regular panellist on BBC1’s Sunday Politics.