Well, rapid industrialization does tend to do that to a country. And while people may feel dubiously over the effect of greenhouse emissions, the immediate concerns of poisoned air, soil, water, and food are a pinch too hard for China to ignore - as well as the widespread damage to ecological species that's also resulted from all that alongside the rapid development of hitherto hinterlands.
Global warming is far too political of a concept now to get anywhere, and I've personally long since passed the point where I think it's even worthwhile to debate. Yes, there are some people on either side who have really done their homework - but most simply adhere to their tribe's stance on it religiously. And, ironically, most would generally agree with taking steps to reduce pollution and punish people who pollute. When the BP oil rig exploded, no one said 'well, this is negligible and it's fine if it happens again.' After Fukushima, no one said 'well, it's totally fine to use these old, outdated, poorly repaired reactors that were designed for a time when the sea level was far lower than it currently is.' No one opens up a bottle of pesticide to marinade their veggies in. But scummy companies and government mismanagement leads all this kind of shit to happen, because there's so little accountability for polluting - and honest businesses that make an effort to be ecologically-minded don't often find a market reward for it, especially if they don't operate primarily in an urban center. This becomes even more evident as you climb up to corporations, which are even less responsive to any pushback to bad environmental policy (thanks to being comfortable insulated by the government from competition).
And this is essentially why I land center-left. Too much regulation or abuse of regulatory power - which the Obama admin did, and the Bureau of Land Management always does - is counterproductive and doesn't help anything, because then the pendulum swings back to 'eh! fuck that! let's dump in the river again!' rather than the market coalescing around new norms such as 'we don't fucking put the nuke waste in the fucking breadbasket.' A completely market-based solution only seems to work if you make the assumption that companies will be held accountable, will generally be honest, and will not be protected by abuse of the legal or interest-group-based system - all things that I don't see happening. Modest regulation that is generally palatable seems like just about the only way to not bring about massive ecological damage for short-term profits -- and prompts more efficient innovators to unsettle cumbersome, sloppy incumbent companies. Teddy McFuckin Roosevelt certainly expanded the power of the federal government too far for my tastes, but the push towards conservation is one I can still agree with as important, even if designating areas reserves isn't really an efficient way to do it.