"Our climate is changing. The planet is warming faster than at any time in the last 10,000 years. Global average temperatures have risen by 0.8ºC since the late 19th century, and 0.2ºC per decade over the past 25 years. Man-made greenhouse gas emissions have caused, and continue to cause, most of the observed temperature rise since the mid 20th century. Millions of tonnes of greenhouse gases are produced every day by human activity. These constant emissions into the Earth's atmosphere continue to drive global warming. "
Population density
Population density is the number of people in a given area (usually given as persons per sq. km.). To find this figure the total population is divided by the area.
Density can be shown on a choropleth map which shows the average density across regions. This is easy to read but disguises major population concentrations.