According to the figure below,how much has atmospheric carbon dioxide (CO2) increased in parts per million (ppm) in approximately the last 50 years? 
Definitions:
Leading Cause
This term refers to the primary or most significant factor contributing to an event or condition, such as the leading cause of death being heart disease in many countries.
2001
A year notable for several global events, including the September 11 terrorist attacks in the United States, which had a profound impact on the world.
Heart Disease
A range of conditions that affect the heart, including coronary artery disease, heart rhythm problems (arrhythmias), and heart defects present at birth, among others.
Life Expectancy
The average number of years an individual or population is expected to live, based on statistical analysis.
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