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The European Union (EU-27) has ca. ... of the world population.
3%
Seawater in respect to its pH-value is ...
neutral
The temperature in the core of our earth is about ... degrees.
2.000
Global fish catches amount to ... tons.
40 million
Electricity consumption is expected to increase till 2050 by ...
25%
... of the global land surface are covered with forests.
10%
The major techniques (presently under development) to produce hydrogen in very large quantities as a basis for a "hydrogen economy" are:
~2 answers
The number of internet users has increased during the last 20 years by a factor of ...
10
The two major scientific achievements after World War II leading to the Third Industrial Revolution are:
~2 answers
The different layers of the atmosphere are called (from bottom to top):
~4 answers
The three countries holding the largest colonial empires were:
~3 answers
Key innovations of the second industrial revolution:
~5 answers
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