The coalition risks a political backlash if it opposes or delays Labor's emissions trading scheme (ETS), new polling suggests.
The federal government wants the parliament to vote next month on its plan to cut emissions by at least five per cent by 2020.
The opposition says it has not been given enough time to properly scrutinise the scheme, due to be up and running by 2011.
But a national Auspoll of more than 1,000 people, on behalf of the Climate Institute, suggests this could be a damaging position for the coalition to take.
More than three quarters of respondents want the opposition's immediate support for the emissions trading scheme, the poll shows.
But despite this, around 60 per cent say they are undecided about which major party would better lead the charge on climate change.
Twenty-seven per cent voted Labor, down from 32 per cent in February, while 14 per cent supported the coalition, up from 12 per cent.