On the left:
The government has committed the UK to cut greenhouse gas emissions by 80% by the middle of this century.
Climate Change and Energy Secretary Ed Miliband said the current 60% target would be replaced by a higher goal.
And on the right:
The government is fighting to head off a backbench rebellion over its plans to exclude aviation and shipping from the UK’s greenhouse gas targets.
They are being left out because there is no system for sharing responsibility for international emissions.