The chart shows changes in sea level from 1995 to 2013. According to the chart, sea levels rose at an average annual rate of 3.24 millimeters from 1995 to 2013. Which questions can be asked to check whether global warming is the cause of rising sea levels? Did the global surface temperature increase steadily from 1995 to 2013? Did sea ice extent in polar regions reduce because of melting from 1995 to 2013? How will the change in sea level affect marine economic activities such as fishing? Will the rise in sea levels cause soil in coastal areas to become less fertile? Which islands are under threat of flooding from rising sea levels?