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Some 400,000 people are expected to travel to Dubai between November 30 and December 12 for the UN's annual Climate Change Conference.
The party leader was accused of having ordered a further review into the plan to borrow £28 billion each year to spend on green industries and environmental initiatives.
Shadow chancellor Rachel Reeves insisted the country's circumstances had 'changed significantly' since the leader made pledges such as to abolish tuition fees.