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"Targets on their own are not enough, they need to be delivered - and for that we need to have workable solutions".

The UN has refused to co-operate with the system, saying it is unethical and workable.

It said the document had been produce to help ensure any legislation that passes through parliament is "workable, effective and enforceable".

"It's not workable. Conservatives are working on new plans so that we can tackle climate change and look after our environment, without bankrupting the UK."

"Unite has put forward workable proposals," she said.