Global Warming Graph

1. What is the horizontal axis showing, and what is the range of values? The horizontal axis shows years. The range of values is 155.
2. Is present day on the right, or the left? Present day is on the left.
3. What is the vertical axis showing, what are the units, and what is the range of values? The vertical axis is showing the temperature in Celsius. The range of the values is 1.
4. The graph was created from data that was gathered.  Does the web page state where the data came from? The webpage states that the data comes from http://data.giss.nasa.gov/gistemp/