If CO2 emissions continue at the current pace, pollen counts are projected to nearly double by 2060.
Spring is arriving earlier across the U.S. by an average of three days.
Scientists say increased CO2 emissions are making poison ivy worse.
Foliage color and timing has been starting later, on average, in a warming world.
The highlights of NOAA's 2013 Spring climate summary.
If it seems like autumn leaves are taking longer to change color, you're not imagining things. Over the past 25 years, the onset of autumn has shifted.
Online searches for the word"pollen" have gone through the roof this spring, and if you know anyone with seasonal allergies (and who doesn't?) this isn't surprising.
A visual look at six plant species that are already being affected by climate change.