The Hunt For Green Helium

Helium is a noble gas, so the helium itself is already green. The helium itself doesn't do any damage to the environment.

However, we only find the helium in pockets of methane meaning that any hunt for helium is really a hunt for methane - a really effective greenhouse gas.

The video explains that scientists are now hunting down pockets of nitrogen with helium rather than methane with helium. That would be a big find.