When the US invades and destroys a country, they call it "bringing freedom". So its probably natural that they'd start referring to methane, a dirty fuel which destroys the global climate and threatens to make the Earth uninhabitable, as "freedom gas":
America is the land of freedom, as any politician will be happy to tell you. What you don’t hear quite so often is that the stuff under the land is also apparently made of freedom as well. That is, at least according to a news release this week from the Department of Energy (DoE).
Mark W Menezes, the US undersecretary of energy, bestowed a peculiar honorific on our continent’s natural resources, dubbing it “freedom gas” in a release touting the DoE’s approval of increased exports of natural gas produced by a Freeport LNG terminal off the coast of Texas.
“Increasing export capacity from the Freeport LNG project is critical to spreading freedom gas throughout the world by giving America’s allies a diverse and affordable source of clean energy,” he said.
[...]
“With the US in another year of record-setting natural gas production, I am pleased that the Department of Energy is doing what it can to promote an efficient regulatory system that allows for molecules of US freedom to be exported to the world,” said Steven Winberg.
America has increasingly become a bad pardoy of itself, and this is more of the same. But where "freedom fries" were harmless, their "freedom gas" poses a direct threat to the lives and security of the entire world (including a hell of a lot of Americans). The best way of defending ourselves against that is to make it an economic dead-end as quickly as possible.