Original sentence: , glacier retreat, reduced summer streamflows, species extinctions and increases in the ranges of disease vectors., though it is difficult to connect specific events to global warming.Other effects may include changes in agricultural yields.There may also be changes in the frequency and intensity of extreme weather events
Edited sentence: Other effects may include changes in agricultural yields, glacier retreat, reduced summer streamflows, species extinctions and increases in the ranges of disease vectors.There may also be changes in the frequency and intensity of extreme weather events, though it is difficult to connect specific events to global warming