US allergy season starting earlier due to global temperature rising, scientists say

Trend sees higher pollen levels and worsened allergy and asthma symptoms, though reduction in carbon emissions could reverse it

As the global temperature has increased in recent years due to climate change, allergy season in the US is starting earlier and the amount of pollen during such periods has increased, leading to worse allergy and asthma symptoms for some - and new symptoms altogether for others, according to scientists.

That trend is projected to increase as average temperatures continue to rise, but could be reversed if humans are able to reduce carbon emissions, allergists say.