From Nature

With the world’s population expected to grow from 6.8 billion today to 9.1 billion by 2050, a certain Malthusian alarmism has set in: how will all these extra mouths be fed? The world’s population more than doubled from 3 billion between 1961 and 2007, yet agricultural output kept pace — and current projections  suggest it will continue to do so. Admittedly, climate change adds a large degree of uncertainty to projections of agricultural output, but that just underlines the importance of monitoring and research to refine those predictions. That aside, in the words of one official at the Food and Agriculture Organization (FAO) of the United Nations, the task of feeding the world’s population in 2050 in itself seems “easily possible”.

Easy, that is, if the world brings into play swathes of extra land, spreads still more fertilizers and pesticides, and further depletes already scarce groundwater supplies. But clearing hundreds of millions of hectares of wildlands — most of the land that would be brought into use is in Latin America and Africa — while increasing today’s brand of resource-intensive, environmentally destructive agriculture is a poor option. Therein lies the real challenge in the coming decades: how to expand agricultural output massively without increasing by much the amount of land used.

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Design Museum at New Designers from Dezeen on Vimeo.

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TR: Explain the moral imperative behind “The Pledge” [in which Gates and Warren Buffett have asked America's 400 wealthiest individuals to pledge half their wealth to charity]. What will it achieve that conventional philanthropic giving cannot, besides raising a greater supply of money? Or is that the whole point?

Gates: Well, I think the idea is pretty simple, and I wouldn’t use the term “moral imperative.” It’s absolutely the case that the U.S. is the most generous country in terms of philanthropic giving. If you look at the large estates in the country, about 15 percent of the value goes to charitable causes, and there are more billionaires today, with more wealth on average, than ever before. And a lot of them may not know how much fun it is to get involved in giving, or know that it’s kind of like starting a new career. And so we decided to create this group who had in common a pledge to give–not to all take one approach or pool money, but merely to find people who had things in common. How long should a foundation last, how do you staff, how do you involve your family? Different things will fit for different people. We did these dinners with some wealthy people, some of whom have done a lot of philanthropy, some of whom have done less. Another key factor is that the earlier in life you think about this stuff, the more opportunity there is for you to take your talent and get involved, or have associates that you know are talented through their work with you get involved. You’re not going to do your best thinking about this if you wait until you’re 92 years old and probably quite influenced by a small group who may have different thoughts. Starting earlier, giving earlier–that works. Those are the themes, and as this year goes on, hopefully we’ll get more people to sign up, and we’ll share that at various milestones. But so far we’ve had lot of good acceptances.

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A new type of device that uses both heat and light from the sun should be more efficient than conventional solar cells, which convert only the light into electricity.

The device relies on a physical principle discovered and demonstrated by researchers at Stanford University. In their prototype, the energy in sunlight excites electrons in an electrode, and heat from the sun coaxes the excited electrons to jump across a vacuum into another electrode, generating an electrical current. The device could be designed to send waste heat to a steam engine and convert 50 percent of the energy in sunlight into electricity–a huge improvement over conventional solar cells.

The most common silicon solar cells convert about 15 percent of the energy in sunlight into electricity. More than half of the incoming solar energy is lost as heat. That’s because the active materials in solar cells can interact with only a particular band of the solar spectrum; photons below a certain energy level simply heat up the cell.

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From Jonathan Glancey, guardian.co.uk

I am standing on the wind-buffeted tip of the Strata tower, looking out through the blades of what appear to be an enormous propeller, at the London skyline and the green basin beyond. St Paul’s cathedral, across the river, seems close enough to touch. It’s the kind of view, and the kind of heroically stylised building, you would expect to see in some 1930s sci-fi movie: the perfect place for a hero and a villain to have a rooftop showdown.

At 147 metres, the newly opened Strata is London’s tallest residential building. The nine-metre blades I’m standing beneath are housed in one of three wind turbines that crown this new tower soaring above Elephant and Castle, an area of the city not known for flashy penthouses. But Elephant and Castle is undergoing a massive, if slow, transition from a rundown miasma of noisy road intersections, underpasses and vast housing estates into what the Borough of Southwark hopes will be a £1.5bn model of inner-city regeneration.

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From Hannah Fearn, Times Higher Education

The climate for universities is harsh. Even before the general election and the new coalition government, the sector had been served notice that huge cuts were on the way. From this year, universities will have to move towards government targets on carbon reduction and energy efficiency or face financial penalties. Sustainability is becoming an urgent issue - and for reasons perhaps less noble and enlightened than saving the planet.

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The International Journal of Environmental, Cultural, Economic and Social Sustainability creates a place for the publication of papers presenting innovative theories and practices of sustainability. The journal is cross-disciplinary in its scope, a meeting point for natural and social scientists, researchers and practitioners, professionals and community representatives.

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