London mayor Ken Livingstone says he aims to make London the world's leading centre for climate change research within the next five years.
Cities are responsible for 75% of emissions, the mayor says
The mayor is in Davos, Switzerland, to attend the World Economic Forum.
He said: "The challenge of climate change requires immediate action across governments and business to effect change."
It comes days after the mayor promised an extra £47m in the city's forthcoming budget to help tackle climate change.
The mayor will be talking about how governments and business can help cities cut down their climate-changing effects.
Mr Livingstone said: "Cities produce 75% of global carbon emissions and it is therefore in cities that the battle against climate change will have to be won.
"To win this battle three things are required. First, determination to tackle climate change and not denial of its reality or consequences.
"Second, the most sophisticated financial institutions to respond to carbon trading and investment in new technologies.
"Third, state of the art scientific and technical research facilities to develop the technological solutions of the future," he said.
The mayor said he wanted London to become the "undisputed world leader in research and financial development on climate change" within the next five years.
The World Economic Forum is an independent international organisation committed to improving the state of the world by engaging leaders in partnerships to shape global, regional and industry agendas.
It is expected to attract more than 2,000 delegates.