Presently, glaciers occupy about 10 percent of the world’s total land area, with most located in polar regions like Antarctica, Greenland, and the Canadian Arctic. Glaciers can be thought of as remnants from the last Ice Age, when ice covered nearly 32 percent of the land, and 30 percent of the oceans. Most glaciers lie within mountain ranges that show evidence of a much greater extent during the ice ages of the past two million years, and more recent indications of retreat in the past few centuries. Climatic factors strongly affect them today and during the current warmer climate, they can retreat in size at a rate easily measured on a yearly scale.

The climate, on a global scale, is always changing, although usually not at a rate fast enough for people to notice. There have been many warm periods, such as when the dinosaurs lived (about 100 million years ago) and many cold periods, such as the last ice age of about 18,000 years ago. During the last ice age much of the northern hemisphere was covered in ice and glaciers. From the 17th century to the late 19th century, the world experienced a “Little Ice Age,” when temperatures were consistently cool enough for glaciers to advance in many areas of the world. Just because water in an ice cap or glacier is not moving does not mean that it does not have a direct effect on other aspects of the water cycle and the weather. Ice is very white, and since white reflects sunlight (and thus, heat), large ice fields can determine weather patterns. Air temperatures can be higher a mile above ice caps than at the surface, and wind patterns, which affect weather systems, can be dramatic around ice-covered landscapes.

When glaciers melt, a huge amount of fresh water can be lost, which millions of people may depend upon for many activities; it supports vast ecosystems that will be endangered in drier conditions. Human activities have caused changes in the natural climate cycle, resulting in a grave environmental challenge. The release of carbon dioxide (CO2) by processes such as the burning of fossil fuels and deforestation is causing average global temperatures to rise, affecting ecosystems. In the polar regions and high mountain areas of the world temperatures are rising faster than the global average, putting those ecosystems at particular risk. Small changes in the average temperature of the planet can translate to large and potentially dangerous shifts in climate and weather. Warmer temperatures cause glaciers to melt faster than they can accumulate new snow.

Glaciers all over the world have been melting for at least the last 50 years, and the rate of melting is speeding up. Many glaciers all over the world have shrunk dramatically. We can reduce the risks we will face from climate change. By making choices that reduce greenhouse gas pollution, and preparing for the changes that are already underway, we can reduce risks from climate change. Our decisions today will shape the world our children and grandchildren will live in. We can all make a difference. The ice is melting now !