Promoting low-carbon development and avoiding the negative impacts of climate change require concerted efforts from all countries around the world. At present，major cities around the world have put forward clear carbon reduction targets and adopted active policies and measures to reduce emissions in areas including transportation，buildings and energy. As one of the global metropolises，Shanghaiis receiving increasingattention for its policy measures to cope with climate change. Based on the 2021 Global Cities Index （GCI） published by Kearney，this study compared the top 30 cities in terms of their targets of carbon peaking and carbon neutrality，and their annual changes in greenhouse gas emissions. Based on the analyses of historical data，carbon footprint per capita and GDP per capita of global city show an inverted U-shape relationship. It is necessary for Shanghai to coordinate the goals of high quality economic growth and cabon emission，establish industrial low-carbon standard，develop low-carbon technology innovation center，thus building a global city model of high quality development and low carbon emission and enhancing the voice in the field of climate change.