What is Climate Change?
What is climate change?
According to the Environmental Protection Agency, climate change is "any significant change in the measures of
How do we know that climate change is happening?
Climate change is a controversial topic. While the reasons for climate change are debated, it is commonly accepted that the climate is undergoing changes, but what those changes are is not always clear.
The image shows data culled from a tide gauge near Sandy Hook, New Jersey. It shows that since 1930, the average sea level has risen by a full foot. Though there have been some periods of time in which the average sea level would decrease, the trend over the past 80 years is clearly one of increase.
The image below presents data about changes in annual global temperature from the National Climate Data Center (NCDC). The years range from 1880 to 2010. Like the previous graph, it shows periods of time with a decreasing difference in average temperature, yet the overall trend is one of increasing temperature. The earth is warming and sea levels are rising, thus the climate is changing. But what happens as a result of such changes is not as clear.
Did You Know?
Journalist Jacob Riis was called "New York's most useful citizen," by Theodore Roosevelt. Riis often accompanied Police Commissioner Roosevelt in raids exposing the hardship of life for New York City's poor and immigrant populations and published his photos in newspapers. More...