Never in the history of mankind have we had the ability to go halfway around the world in one day, or hold a conversation with someone halfway around the world with mere seconds of latency.

Never in the history of mankind have we had weapons capable of annihilating a city with one shot.

Never in the history of mankind have we accessed enough energy and matter to change the balance of the global atmospheric gas concentrations.

This is a time in human history where "never in the history of mankind" things should be given serious consideration.