The idea is that a certain number of emissions units get issued to all persons aged 18 and over residing within a particular country. (nofrakkingconsensus.com)
Some firms were better off, being able to outperform the requirements of the program and so increase profit through trading emission units. (corporateknights.com)
It sees international trading in emissions units as a legitimate and possibly large part of the overall contribution. (theconversation.com)