wolfy42 posted...Boom, someone lit a cig.
Archer, Helium is non-flammable.
Also, the mass of the atmosphere is approx. 5.15x 10^18 (metric) tons. 10 trillion tons is 10^13 tons. So the atmosphere is now more than 50 wt% helium.
https://en.m.wikipedia.org/wiki/Atmosphere_of_Earth