A Labor government in NSW would expand national parks to protect koalas, curb feral horses, and step up climate change action including setting a target to source half the state's electricity from renewables by 2030.

A Climate Change Summit would be called within the first year of a Daley-led government to determine the best pathways to achieving net zero emissions by 2050. The gathering would inform a Climate Change Act to drive the transition, including the setting of interim goals for 2025, Labor said in a statement.

Land clearing is having a devastating impact on koala numbers in the Moree region. Credit:Nick Moir

The burst of election policies, announced on Thursday, was generally welcomed by environment groups, although several called for an immediate moratorium of deforestation of koala habitat to arrest a rapid drop in the numbers of the much-loved marsupial.

"NSW doesn't have another four years to waste to take real action on climate change and to arrest the biodiversity crisis in the state," Penny Sharpe, Labor's deputy leader and environment spokeswoman, said. "This really is the line in the sand."