🚀 go-pugleaf

 From http://peacelegacy.org :

Four and a half billion years... half way through the lifetime of a 
planet... for some of that time molten and dead from bombardment in the 
early formation of the solar system... for most of the remainder 
inhabited only by single-celled life forms. And for a 'mere' half 
billion years, a flourishing of plants and animals. Then at last, for 
the merest flicker of geological time, there are human beings. How very 
long it took until a tool-making, syntactic language-using, 
self-reflecting species arose�for the first time and (for all we know) 
the only time in the entire galaxy.

But life on Earth is dangerous. Mass extinctions can happen slowly 
through geological changes that cause vulcanism and planetary cooling, 
or quickly through a collision with a meteorite. A nearby star could 
become a supernova. At least twice in its long lifetime, Earth has been 
frozen solid or nearly solid all the way to the equator�the sort of ice 
age which, if it happened now, would exterminate all multicellular life. 
Bacteria would once again be the only life forms. By the greatest of 
good fortune, our planet has survived until it is within reach of safety 
from cosmic disasters: its latest creation, ourselves, is slowly 
maturing in its capacity to develop the means to safeguard the planet 
for all life.

  Read more �  http://peacelegacy.org/articles/once-world-time