I don't know much about production and the carbon footprint it leaves, but China is the leader in producing renewable energy sources and converting their infrastructure to green technology:
"China is already leading in renewable energy production figures. It is currently the world's largest producer of
wind and solar energy,9 and the largest domestic and outbound investor in renewable energy. Four of the world's five biggest renewable energy deals were made by Chinese companies in 2016."
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"China is the
world's leading country in electricity production from renewable energy sources, with over double the generation of the second-ranking country, the
United States."
en.wikipedia.org