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4. New solar technologies could easily have supplied a double-digit
percentage of energy used by now.
5. It was/is the prime example of confluence, rather than conflict, of
environmental and economic wellness.
6. Expensive, high-grade focusing devices could have been available by
easy mass-production in the 70s.
7. That is not to say that working for SE can be dangerous.
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Упражнение 4.
Ответьте на вопросы.
1. What is the sun for our life?
2. What could the sun provide for the mankind nowadays?
3. When and why was a widespread enthusiasm concerning solar energy?
4. What is the main key to serious direct solar energy?
5. What are the problems associated with solar progress?
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