NBC Doc Who Helped Obama Push Climate Change Blames it for Allergies: Dr. Natalie Azar: 'It's a terrible allergy season. A couple reasons. One is that we had a really late winter....Another reason is climate change raises carbon dioxide levels -- really contributes to the pollen.'
Singer: 'I accept the theoretical existence of a greenhouse effect. In other words, I recognize carbon dioxide, water vapor, and other gases in the atmosphere can absorb infrared radiation and have a potential effect on climate. On the other hand, I am not convinced these effects really exist to any appreciable extent, so I am definitely not a lukewarmer.'