Hydrogen storage is the No. 1 problem.

This is not a partisan problem at all, with hydrogen.

No matter which [end] you are on, you see all the storage.

The problem with hydrogen is that it is not a very portable fuel.

Hydrogen is the smallest atom, and so is extremely difficult to contain. It is also potentially hazardous, so storage solutions are a critical part of the technology challenge.

Billie Joe: "Do you have a problem? I have a gun. I'll shoot you. No problem."