What does the author mean when he writes, "dr. v is simultaneously the fellow villager that he once was, and continues to be, and the extraordinary healer he has become"?

He means that "despite his success and great importance, Dr. V remains humble". 

The writer stayed through one week volunteering at an eye healing facility in India where a huge number of patients recover their sight every year. He was profoundly touched by the dedication of Dr. V and his team to helping their patients. The experience appears to have impacted the writer's own particular point of view.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.