More and more Americans are acutely suffering from allergies these days, and we are doing so for longer periods of time -- that is, in some cases, we can suffer for months rather than weeks. And more and more of us are developing allergy problems in adulthood -- rather than childhood -- which seems like a reversal of how things used to be. Why is all this going on, and why now? And is climate change somehow involved? Our guest on ST is Dr. Richard Weber, who is an allergy/immunology specialist with National Jewish Health in Denver, Colorado. Dr.