A new global carbon trading market could be held hostage by speculators

Our planet's future hangs in the balance due to the unabated greenhouse gas emissions from burning fossil fuels. Treating these emissions as something that can be owned and exchanged in a market has been touted as a solution since the early 1990s, when UN negotiations to agree a limit to global heating began. At the latest round of talks in Azerbaijan, countries finally agreed rules for a global carbon credit market.