There will be more itching, sneezing, swelling and gasping for breath as Pennsylvania’s climate shifts and residents are exposed to more poison ivy, stinging insects, pollen allergies and lyme-disease-bearing ticks, and experience increased asthma, respiratory disease and heat-related deaths. That was the assessment of scientists and physicians at a one-day climate change conference sponsored by the Allegheny County Health Department and the University of Pittsburgh’s Graduate School of Public Health.