Stockholm’s trajectory to becoming fossil fuel-free by 2040 is well under way, the Swedish capital city’s mayor said at the United Nations climate summit.

“Our best practices are having a tough goal, one that reachable and not so far away that we can think about in our day to day,” said Mayor Karin Wanngard in a Bloomberg television interview on Friday in Paris.

Cities are taking steps to lower greenhouse emissions, from Seattle to Shenzhen in China. Their participation backs an international effort on global warming, since two third of the planet’s population will be living in urban areas by 2050.

Stockholm’s government is collaborating with private companies and universities to find ways to fight climate change, Wanngard said. Green transportation and housing are fueling Stockholm’s shift towards clean energy. They are working with Telefonaktiebolaget LM Ericsson, one of Sweden’s largest companies.

“Economic growth goes hand in hand with ecological growth. It is important for CEOs to be involved in the process,” Wanngard said. “Citizens need to be involved to change behavior.”

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