Nicked from rec.arts.sf.written, but especially frustrating to me because I KNOW I read the story, and quite recently -- probably last year, quite possibly online:

>From a friend:
>
>> It's set in a post-ecological-disaster world. The characters spend a lot
>> of time wiping dust off their few remaining trees, and repenting the
>> actions of generations past that caused the disaster. Any time they find
>> artifacts from the past, they're burned as part of a religious ceremony.
>> They do not produce carbon any other times. The heroine, a youngish girl
>> (ten maybe?) finds a copy of "Alice in Wonderland" and secretly reads it
>> with her grandmother. Towards the end, they get discovered and are in a
>> lot of trouble.
>>