Labour mayoral candidate Sadiq Khan has pledged to London run entirely on clean energy by 2050 if he is elected in 2016.

The current Labour MP for Tooting claims he is committed to getting the capital meeting its emissions targets by the middle of the century.

The Guardian reported Khan was speaking at the Royal Institute of British Architects at the launch of the 100% London campaign, based on a study which claims the capital is behind schedule on its carbon reduction targets.

Khan said: “Yes to 100% London. If it’s good enough for Sydney and Copenhagen and New York, why not London? We’ve fallen behind in our 2025 target. I want to be the greenest mayor London’s ever had.”

Tory mayoral candidate Zac Goldsmith said: “100% London is 100% necessary. I welcome the 100% London campaign and will look closely at IPPR’s zero carbon plan to see what we need to do to make sure that we in London take on the challenge of climate change.”

The report by IPPR argues that City Hall is not on course to meet its target to reduce carbon emissions by 60% by 2025 from 1990 levels.