I don't think that a desire for slowing climate change or some kind of compliance with the international trend, is the driver of their renewable energies strate

I don't think that a desire for slowing climate change or some kind of compliance with the international trend, is the driver of their renewable energies strategy. China has only very little fossil fuel available, and coal tends to be labor intensive (another thing they are running out of) and very dirty locally. So to meet their energy demands and be less dependent on the oil market, they probably should invest in renewable sources. And it doesn't hurt that they can build up the production capacity for such sources through public investment. They are also building lots of nuclear plants. Which is a lot easier when citizens generally don't feel like objecting much.