Approximately how long are fossil fuels going to last (at the present level of consumption)?
Forever
Millennia
Century
The sun shines lots of energy towards the earth. Approximately how many times more than our present levels of consumption?
10,000
100
1,000,000
If we replaced ALL our present energy needs with solar cells, how much of the surface would need to be covered?
10,000 square kilometers
1 million square kilometers
billion square kilometers
In theory, we could fly a large transatlantic flight by using batteries to power the aircraft. How many tons of batteries should the plane load for such a flight?
10
1000
At present, fossil fuels constitute our major source of primary energy, yet they are also the cause of large looming problems. Which among them seems the most dangerous one?
Pollution
Climate change
Acid rains
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