Name a major #innovation of the second half of the C20th.

Of course, you're going to say:
the #personalcomupter or #mobilephone, or perhaps, #renewableenergy or the #internet;

For me, we need to also reserve a place for the (humble?) #container; it revolutionised the possibilities of #internationaltrade, facilitated (for good or ill) global #supplychains and changed the way we understood what was available to buy everyday (not as rare luxuries);

Also of course its supportive #infrastructure!