Have a look at this and look at the links inside for more info: https://web.archive.org/web/20230716192140/https://threadreaderapp.com/thread/1680243524124516352.html

People will bring up coal to challenge the argument that China is serious about taking climate change. China is building many new coal plants, which seems counterintuitive. I, and I'm sure they, would prefer not to. But they're not quite ready to fully transition off, so the next best thing is upgrading then. If you look into the details, they're replacing old plants with incredibly efficient ones. Here's a separate link about that: https://www.americanprogress.org/article/everything-think-know-coal-china-wrong/

We had a bit of a discussion about all this, here: https://lemmygrad.ml/post/971810

Edit: China is also building high speed rail to help other countries transition away from cars and old, inefficient rail. E.g. in Indonesia: https://www.globaltimes.cn/page/202208/1273572.shtml and in Laos: https://www.reuters.com/markets/deals/china-laos-open-6-billion-high-speed-rail-link-2021-12-03/ . This is part of global plans, such as the BRI (Belt and Road Initiative).

There are environmental concerns with BRI, e.g. https://doi.org/10.1177/21582440221078836 and https://yaleclimateconnections.org/2020/02/the-potential-climate-consequences-of-chinas-belt-and-roads-initiative/ . The World Bank's view is negative-to-mixed: https://www.worldbank.org/en/topic/regional-integration/brief/belt-and-road-initiative .

It must me remembered, however, that many if not most of the states that China is working with aren't even close to their 'fair share' of global emissions: https://doi.org/10.1016/S2542-5196(22)00044-4 . As the tech improves, the emissions attached to BRI development will reduce.