In 3 - 4 years, we'll see sustainable amounts of curriculum that use immersive worlds and augmented reality.» (edsurge.com)
Biomass is really important, but it seems really unlikely that anyone will have enough if they limit themselves to sustainable amounts of biomass, except perhaps Brazil. (dotearth.blogs.nytimes.com)
If all the water used to irrigate the crops fell from the sky as rain or was taken from rivers or underground sources in sustainable amounts we'd be in good shape, but sadly and increasingly, that is not the case (see sidebar for more on this). (bookbrowse.com)