The impact of climate change is already being felt in the Philadelphia region.
Darby, Delaware County, isn't where you'd expect to see an area of great concern, but it is.
Because, like many neighborhoods here, it's beside a creek that overflows its banks again and again, especially when tropical systems arrive.
Irene, Floyd, Sandy and, more recently, Isaias all put this area underwater.
Also submerged was the Eastwick section of Philadelphia, just four miles away and right next to Philadelphia International Airport.
Warmer oceans create more intense hurricanes, not only impacting the coast but creating devastating inland flooding. When creeks rise, in many cases, the water has no place else to go but into homes.
Experts also point to a disparity in the effects of climate change. Darby, for example, has twice the national poverty rate. Many low-income neighborhoods, where housing is cheaper, lie in flood plains.
And the floods have become more intense. Seven of the top 10 biggest floods for Darby and nearby Chester Creek have occurred during the past 20 years.
The trend is very clear. Average seasonal temperatures from 1970 to now in Philadelphia show warming at the rate of more than 2-1/2 degrees in spring, summer and fall.
Winters are, by far, warming the fastest, jumping by nearly five degrees over the past 50 years.
Even though winters are getting warmer, with more water vapor in the air winter storms are becoming more intense. Four of our top 10 biggest snowstorms occurred over the past 20 years, along with our top two snowiest seasons.
National Geographic projections indicate that, if current trends continue, by the 2070s Philadelphia will feel more like northeast Arkansas, in terms of temperature and precipitation patterns.
Average maximum winter temperatures will climb from 41 to 49 degrees, and average maximum summer temperatures will jump from 84 to 93.
This is a staggering forecast: Extreme heat, with the number of days above 95 a year, would soar, from an average of 6-1/2 now to as many as 52 a year by the 2070s.
For more on the impact of climate change, join Cecily and other ABC meteorologists for Our America: Climate of Hope.
It can be seen Sunday, April 18 at 1p.m. on 6abc.
It will also be on our 6abc streaming TV apps beginning Friday, April 16.