In areas where speed of wind is usually high, wind mills can provide electricity without any adverse impact on the environment but it's not yet been explored on a large scale. What is the correct reason out of the following?
- Lack of technological devices.
- High cost.
- Non-availability of land.
- Only 2
- Both 1 and 2
- Both 2 and 3
- All of these.
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- Both 1 and 2
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