AAP: ABOUT 1000 of the nation’s biggest polluters will be required to purchase permits under an emissions trading scheme (ETS), Climate Change Minister Penny Wong has said. The Federal Government will release on Wednesday a Green Paper on an ETS, which is likely to include a proposed model. Senator Wong has said the Government estimated about 1000 Australian business would be required to take part in the scheme. “The government puts a limit on how much carbon pollution …