The challenge has been set up to find innovative new solutions to urban heating that go beyond burning fossil fuels and biomass to help the city meet its goal to be carbon-neutral by 2035.
The Finnish capital is inviting innovators to come up with "game-changing" ideas for the future of urban heating which can be implemented in Helsinki but shared around the world.
The Finnish capital wants to find a way of replacing coal with carbon-neutral and low-biomass solutions, and is challenging other cities to join the quest.
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