Which of the following phenomenons would be considered an observable indication of global warming? the increased use of automobiles in the 20th century deforestation in the Pacific Northwest of the United States rising sea levels recorded due to melting glaciers an increase in recycling of consumer waste products

Of the phenomenons listed, the one that would be considered an observable indication of global warming (or more aptly put, climate change) would be C. rising sea levels recorded due to melting glaciers. A and B would not be considered observable indications because their presence does not indicate climate change, but rather can be looked at as causes rather than outcomes of climate change. D is similar in this respect. C is the only option listed that can be viewed as an outcome of climate change.