Allergies and asthma are on the rise -- and experts say climate change is a major contributor to the trend.
The president of the Canadian Association of Physicians for the Environment says global warming means plants release more pollen for a longer time than they did in previous decades.
Dr. Melissa Lem says climate change is also behind other types of allergies, such air pollution and flooding, which causes mould.
Lem says over the last few years, more patients have told her they've developed allergies for the first time.
