Press-Register: More than three-quarters of Alabamians believe global warming is a reality, but they are split on whether human activities are responsible, the findings of a new Press-Register/University of South Alabama poll suggest. And while many scientists regard climate change as the gravest environmental threat confronting the Earth, barely one in six Alabamians feels that way. Even so, more than half of those surveyed are willing to make at least a minor financial sacrifice to help stop it, …