As temporary custodians of the planet, those who are alive at any
given time can do a better or worse job of handing it on to their successors.
I take that simple thought to animate concerns about what we
ought to be doing to preserve conditions that will make life worth living
(or indeed liveable at all) in the future, and especially in the time
after those currently alive will have died (‘future generations’). There
are widespread suspicions that we are not doing enough for future
generations, but how do we determine what is enough? Putting the
question in that way leads us, I suggest, towards a formulation of it in
terms of intergenerational justice.