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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Ansbach puts Europe's bravest politician under pressure

Angela Merkel must respond to a series of tragedies and criticisms of her refugee policy. 

Angela Merkel, the Chancellor of Germany, is supposed to be on holiday. Two separate attacks have put an end to that. The first, a mass shooting in Munich, was at first widely believed to be a terrorist attack, but later turned out to be the actions of a loner obsessed with US high school shootings. The second, where a man blew himself up in the town of Ansbach, caused less physical damage - three were seriously injured, but none killed. Nevertheless, this event may prove to affect even more people's lives. Because that man had come to Germany claiming to be a Syrian refugee. 

The attack came hours after a Syrian refugee murdered a pregnant Polish woman, a co-woker in a snack bar, in Reutlingen. All eyes will now be on Merkel who, more than any other European politician, is held responsible for Syrian refugees in Europe.

In 2015, when other European states were erecting barriers to keep out the million migrants and refugees marching north, Merkel kept Germany's borders open. The country has resettled 41,899 Syrians since 2013, according to the UNHCR, of which 20,067 came on humanitarian grounds and 21,832 through private sponsorship. That is twice as much as the UK has pledged to resettle by 2020. The actual number of Syrians in Germany is far higher - 90 per cent of the 102,400 Syrians applying for EU asylum in the first quarter of 2016 were registered there. 

Merkel is the bravest of Europe's politicians. Contrary to some assertions on the right, she did not invent the refugee crisis. Five years of brutal war in Syria did that. Merkel was simply the first of the continent's most prominent leaders to stop ignoring it. If Germany had not absorbed so many refugees, they would still be in central Europe and the Balkans, and we would be seeing even more pictures of starved children in informal camps than we do today. 

Equally, the problems facing Merkel now are not hers alone. These are the problems facing all of Europe's major states, whether or not they recognise them. 

Take the failed Syrian asylum seeker of Ansbach (his application was rejected but he could not be deported back to a warzone). In Germany, his application could at least be considered, and rejected. Europe as a whole has not invested in the processing centres required to determine who is a Syrian civilian, who might be a Syrian combatant and who is simply taking advantage of the black market in Syrian passports to masquerade as a refugee. 

Secondly, there is the subject of trauma. The Munich shooter appears to have had no links to Islamic State or Syria, but his act underlines the fact you do not need a grand political narrative to inflict hurt on others. Syrians who have experienced unspeakable violence either in their homeland or en route to Europe are left psychologically damaged. That is not to suggest they will turn to violence. But it is still safer to offer such people therapy than leave them to drift around Europe, unmonitored and unsupported, as other countries seem willing to do. 

Third, there is the question of lawlessness. Syrians have been blamed for everything from the Cologne attacks in January to creeping Islamist radicalisation. But apart from the fact that these reports can turn out to be overblown (two of the 58 men arrested over Cologne were Syrians), it is unclear what the alternative would be. Policies that force Syrians underground have already greatly empowered Europe's network of human traffickers and thugs.

So far, Merkel seems to be standing her ground. Her home affairs spokesman, Stephan Mayer, told the BBC that Germany had room to improve on its asylum policy, but stressed each attack was different. 

He said: "Horrible things take place in Syria. And it is the biggest humanitarian catastrophe, so it is completely wrong to blame Angela Merkel, or her refugee policies, for these incidents." Many will do, all the same.