The Conservatives promise to cut the government's carbon emissions by 10% within a year of gaining power.
From: news.bbc.co.uk
In a speech at Imperial College London, Mr Osborne will also promise to set up a "green investment bank" and to work with companies to tackle pollution.
Ahead of his speech, Mr Osborne told the BBC: "I'm going to cut energy budgets... and say [to Whitehall departments] 'Look, now you have to go and deliver the 10% cuts that we have promised.'"
He also accused Labour of being "too negative" in its attitude to the environment, relying on taxation rather than incentives to change people's habits.
In his speech Mr Osborne will say that a green investment bank will "back the bright ideas of the future in an area where Britain is now lagging behind".
