Twenty local governments, representing areas producing 5 percent of global climate-changing emissions, have committed to targets to cut those emissions, with the majority also setting goals for renewable energy, a platform uniting them said on Thursday.

The Compact of States and Regions, launched last September, said more local governments would join the effort over the summer, making their combined emissions savings one of the most significant pledges to be presented ahead of a new United Nations climate deal due in December.

The state and regional governments that have already set targets include British Columbia, California, Ontario, Oregon, Quebec, New York, Washington, Rio de Janeiro, Sao Paulo, the Basque Country, Catalonia, Lombardy, Rhone-Alpes, Scotland, Wales, Australian Capital Territory and South Australia.