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Even if it could be determined with 100% certainty that fires did in fact "wipe out" pristine landscape, there is absolutely no certain way to determine if humans were in fact the cause. Fires ignite naturally all the time. I believe Australia was still a real hot place 45,000 years ago. Granted this article does in fact use phrases like "best fit" and "we don't think" and the type of carbon "gives a picture" all showing the obvious lack of any ability to ascertain with acceptable reliability their speculation, It still strongly states that "evil man" is the cause of destruction.

That being said, if man did set fires for the reasons stated one has to ask how dense was the human population? Enough to impact the whole species in all areas? If fires got out of control then that would suggest an environment that is conducive to natural causes for fires. So even though the title is a possibility, the absolute statement that man is in fact the lone and sole cause is malarkey. Yes I have read the concluding sentence:

It is likely that extinctions were not caused by any single event, but reflect compounding factors such as natural climate changes associated with the Ice Age fluctuations and, quite possibly, the arrival of humans."

This should have been the introduction IMO if an article of this type is to be take seriously.