Higher levels of carbon dioxide in the atmosphere lead to a more acidic ocean.
Each of the National Parks faces unique challenges from climate change, including increased heat.
Allergy season is getting longer and worse in a warming world with more carbon dioxide.
An early spring can disrupt plant & animal behaviors and make it more difficult on farming.
On the current greenhouse emissions path, spring may start an average of three weeks earlier by 2100.
In many parts of the country, changes in climate have likely increased habitat suitability for mosquitoes.
Climate change has impacted the size and geographical distribution of tick populations.
More CO2 means larger poison ivy plants and more toxic oil per plant.