We usually pay attention to how the weather changes throughout a week, a month, or even compared to previous few years. On the other hand, there are changes that are not visible and can only be observed by scientists using sensitive equipment. Certain patterns in weather that have a tendency to recur each year are called a climate. Nowadays scientists claim that there are major changes to the climate all over the world that will have, or already have, dire consequences.
Consider these facts provided by NASA:
- Global temperature increased by 1.4 degrees Fahrenheit since 1880. Nine of the ten warmest years on record have occurred since 2000.
- The amount of land ice decreases by 258 billion tons per year. Greenland ice loss doubled between 1996 and 2005.
- The amount of carbon dioxide parts increased to 399.60 per million. Its levels in the air are at its highest in 650,000 years.
- The amount of arctic ice decreases by 13.3 percent per decade. In 2012, Arctic summer ice shrank to the lowest extent on the record.