Here’s how climate change plays a role in tick migration and the spread of Lyme disease.
See the trend in hot days in these U.S. cities.
A small increase in average temperature leads to a big increase in extreme heat.
Warming waters are decreasing oxygen in the oceans, creating dead zones for marine plants and animals.
Excessive carbon emissions are worsening the ocean's health.
The first day with summer-like temperatures is happening earlier for most of these cities.
Since the first Earth Day in 1970, the average annual temperature in every state has climbed.
As the climate changes, see the trend in warmer-than-normal spring days in these cities.