Around three quarters of the increase in CO2 levels from human activity over the last 20 years is from the burning of fossil fuels. The rest is made up largely of land use changes such as deforestation.

The original name of Nashville, Tennessee was Big Salt Lick.

Homing pigeons use roads where possible to help find their way home. In fact, some pigeons followed roads so closely that they actually flew around traffic circles before choosing the exit that led them home.

AMAZING FACTS