What approximate percentage of the global population lives in cities?
A. 20%
B. 35%
C. 50%
D. 70%
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How does atmospheric carbon dioxide affect the Earth’s climate?
A. It decays radioactively and produces heat
B. It reflects solar radiation releasing more heat to the Earth´s atmosphere
C. It captures more solar radiation trapping in heat in the Earth´s atmosphere
D. It changes the colour of the atmosphere
How old is the Earth?
A. 1 billion years
B. 180 000 years
C. 4.5 billion years
D. 3 million years
What is the Montreal Protocol?
A Free trade agreement between the USA and Canada
B. An international directive on how to conserve endangered species
C. An international treaty designed to protect the ozone layer
D. An international agreement designed to reduce GHG emissions
What are generally considered to be the three components of sustainable development?
A. Design, engineering, and culture
B. Energy, water, and biodiversity
C. Society, economy, and environment
D. Social, economic, and spiritual awareness
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