The World Health Organization says every year hundreds of millions of people are becoming ill with preventable chronic respiratory diseases.
|Ragweed is flourishing, sending more pollen into the air and making many people miserable with an allergic condition called hay fever|
One of the most common allergies is said to be hay fever, which is caused by contact with ragweed [Botanical name: artemisiifolia]. Scientists now say the increase in ragweed is stimulated by climate change. VOA's Melinda Smith has more on this condition.