[cheepin]

He was almost assuredly talking about enforcing carbon tax. Enforcing working hours limits has already been accomplished in many countries.

[vkou]

Enforcing a carbon tax is trivial, since fossil fuel extraction is centralized. It does, however, require heavy tariffs against goods imported from countries that don't have carbon taxes.

[xapata]

A carbon tax would be very easy to implement in most countries since almost all carbon is extracted from the ground by just a handful of major corporations.