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Not everyone in the world forward to the joys of spring. While many people delight in observing the glory of newly-formed buds their delicate blossoms, others this annual phenomenon. That's because blooming plants bring seasonal allergies like hay fever. The National Phenology Network (NPN) in the USA has hay fever sufferers that spring has arrived up to four weeks earlier than usual. The pollen that so many symptoms is already misery. To make matters worse, the warmer weather will hay fever season. The NPN said: "It's a little unsettling. It perhaps isn't surprising, the trajectory our planet on."

Phenologists, climatologists and meteorologists are climate change for the unseasonably warmer weather. The National Oceanic and Atmospheric Administration that the U.S. winter's average temperature was 2.7 degrees warmer than the 20th century average. Lauren Casey, a meteorologist with Climate Central, the CNN news agency that climate change is in earlier and longer seasons for plants, a greater prevalence of pollen. She pollen was "the enemy" of people who from allergies. She said pollen can asthma attacks and mold allergies. Another scientist said: "Acting on climate change really matter for people's health."

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