On Father's Day in 2007 CPCHE released a report summarizing the scientific evidence pointing to greater environmental health risks for boys. For the health impacts of concern, including asthma, cancer, birth defects and learning and behavioural problems, boys are both more frequently affected and often more highly exposed to contaminants associated with these health impacts. Of particular concern are the much higher rates of learning and behavioural problems in boys and the rise in certain birth defects in the male reproductive system.