The basic idea of the carbon credits or permits market is that in order to emit CO2 (or equivalents) you need to have a permit to do so.

FORBES: Misunderstanding the Carbon Credits Market

Each credit is the right to emit one metric ton of carbon dioxide or its equivalent in other greenhouse gases.

FORBES: Magazine Article

Under a new FDA new proposal, they would be reclassified to a midrisk category, and companies would be required to prove to the FDA that their software is up to date, their sunlamps emit the right amount of energy and all safety control measures are in place.

CNN: Indoor tanning industry under scrutiny