It is not easy to find a tipping point: that one moment that can signify a
definitive and fundamental change. In the past, true change in minerals
and metals has happened over a longer period of time through a series
of trends . . .

It is not easy to find a tipping point: that one moment that can signify a
definitive and fundamental change. In the past, true change in minerals
and metals has happened over a longer period of time through a series
of trends . . .