"Before Present" doesn't seem terribly scientific, since "today" rapidly becomes yesterday.
I don't care whether they pick the alleged year of the alleged birth of Jesus of Nazareth as a fixed point or something else, but they ought to pick something.
See post 18.
Just read that B.P., aka Before Present and Before Physics, apparently is counted from 1950, before nuclear testing changed carbon dating. It's about as arbitrary as using the estimation of Jesus' birth, which is before major man-made explosions in general. It's also known as C.E., aka Common Era, Current Era and Christian Era.