Harry, it's sure that we cater for ecotourism. Maybe not with the title "ecotourism".
Do you have any idea for you trip in October? Maybe we can offer some help.
http://www.chinatourguide.com/china_tour/china_minority_religion.html For you reference. over 6 years ago
There is very little in the way of eco-tourism by any definition. Try: http://fordie.hubpages.com/hub/Eco-Tourism-Opportunities-Around-Jiuzhaigou-National-Park-China about 6 years ago
In my experiences of living & travelling in China, I'd have to say no, but the south & south-west of China has the cleanest air (ie: less pollution) & waterways than in the larger cities. In other words, you can see blue skies (rather than yellow) and can swim in the rivers etc (safely, without risk of getting sick). about 6 years ago