On 21 October the Japanese government announced that is introducing a voluntary emissions trading scheme. The government hopes that many companies will sign up to what could become a forerunner of a mandatory scheme. Companies will set their own emissions targets. They will not be penalised if they do not meet the targets but will be able to buy credits if they wish from other companies that do not reach their self-imposed limits on GHG emissions. Green groups have criticised the trial system as a "no cap and little trade" scheme that is too lenient and ineffective in cutting emissions.