Climate change is posing a grand challenge for human society. Now that the international consensus on jointly tackling climate change has been reached and China increasingly takes a leading role in global climate governance, climate change is supposed to be a key part of Zhejiang's initiative of being an “Important Window”. To this end, Zhejiang must be dedicated to timely achieving peak emissions by continuously promoting structural emission reduction in industry, energy, and transportation, planning for actions on carbon neutrality with unconventional measures to tap the potential of natural and artificial carbon sinks, improving the carbon emission rights and carbon sink trading mechanism and establishing comprehensive leadership, market and social mechanisms of climate governance, to serve as an institutional basis for Zhejiang to create the “Important Window” for tackling climate change.