Everything we think about regarding sustainability - from energy to agriculture to manufacturing to population - has a water footprint. Almost all of the water on Earth is salt water, and the remaining freshwater supplies are split between agricultural use and human use - as well as maintaining the existing natural environment.

As useful as websites and journals are, there's real value in books, too.

Is there a better example of natural selection in action than 'Project Runway?'

Nature stopped being natural decades ago.

My own suspicion is that a stand-alone artificial mind will be more a tool of narrow utility than something especially apocalyptic.

Even if we were to stop putting out greenhouse gases right now, we'd still face decades of warming.

Don't expect to be able to upload your cat's brain into your Roomba any time soon.