The effects of climate change are all around us, making environmental protection and sustainability both critical to our future. Helsinki, the capital of Finland, has made an ambitious pledge to be carbon neutral by 2035. Jan Vapaavuori, the mayor of Helsinki, recently sat down with Tencent’s Chief eXploration Officer David Wallerstein to talk about what the city is doing to combat climate change and how it plans to become a sustainable and smart city. We learn that there is no silver bullet, but that technology can accelerate progress. Reversing current climate trends also means that all stakeholders, from governments to businesses, researchers and citizens, need to act together.