In 1750 there were about 800 million people in the world. In 1850 there were a billion more, and by 1950, another billion. Then it took just 50 years to double to 6 billion.

In 1870 there were more Irish living in London than in Dublin.

The world average of egg consumption per capita is 230.

Since 1972, some 64 million tons of aluminum cans (about 3 trillion cans) have been produced. Placed end-to-end, they could stretch to the moon about a thousand times. Cans represent less than 1% of solid waste material.

New Zealand is home to 4 million people and 70 million sheep.

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