Read an excerpt from the Nobel Lecture by Al Gore: We, the human species, are confronting a planetary emergency a threat to the survival of our civilization that is gathering ominous and destructive potential even as we gather here. But there is hopeful news as well: we have the ability to solve this crisis and avoid the worst though not all of its consequences, if we act boldly, decisively and quickly.How does this excerpt develop Gore's theme that climate change is a problem that must be addressed? A.By listing groups that support action B.By providing scientific evidence to support his claim C.By describing concrete solutions to the problem D.By creating a sense of urgency