What Are Greenhouse Gases?
Many chemical compounds found in the Earth’s atmosphere act as “greenhouse gases.” These gases allow sunlight to enter the atmosphere freely. When sunlight strikes the Earth’s surface, some of it is re-radiated back towards space as infrared radiation (heat). Greenhouse gases absorb this infrared radiation and trap the heat in the atmosphere. Many gases exhibit these “greenhouse” properties. Some of them occur in nature (water vapor, carbon dioxide, methane, and nitrous oxide), while others are exclusively human made (certain industrial gases).

Why Are Atmospheric Levels Increasing?
Levels of several important greenhouse gases have increased by about 25 percent since large-scale industrialization began around 150 years ago. During the past 20 years, about three-quarters of human-caused emissions came from the burning of fossil fuels.

What Effect Do Greenhouse Gases Have on Climate Change?
In computer-based models, rising concentrations of greenhouse gases produce an increase in the average surface temperature of the Earth over time. Rising temperatures may, in turn, produce changes in precipitation patterns, storm severity, and sea level commonly referred to as “climate change.”
Assessments by the Intergovernmental Panel on Climate Change (IPCC) suggest that the Earth’s climate has warmed between 0.6 and 0.9 degrees Celsius over the past century and that human activity affecting the atmosphere is “very likely” an important driving factor.

How can you help?

All over America, communities are taking action to help reduce emissions. From hybrid vehicle fleets in Charlotte, to green buildings in Austin and homes powered with renewable energy in Seattle, local governments are moving forward with innovative energy solutions that help to curb climate warming, save taxpayers and business dollars, and create healthier cities.

Help us with your own ideas as we make Chester County the best and greenest county in PA!