An education advertisement released by the Federal Government claims every school in Australia will be affected by cuts planned by Opposition Leader Tony Abbott.

Finance Minister Penny Wong claims there is a $2.4 billion hole in the Coalition's costing of its plan to shed 12,000 public service jobs.

Opposition Climate spokesman Greg Hunt claims CSIRO research shows carbon emissions can be reduced by 20 per cent over 40 years using nature, soils and trees.

An advertisement by the National Tertiary Education Union claims there are almost twice as many university students per teacher now than there were a generation ago.

Prime Minister Kevin Rudd claims building a high speed rail project from Brisbane to Melbourne by 2035 would cost less than the Coalition's paid parental leave scheme for the same period of time.