Why is there a need to harness non-conventional sources of energy ? How can energy be harnessed from the sea in different ways ?

Explanation

**Step-by-Step Solution:**

**1. Understanding the Need for Non-Conventional Sources of Energy:**
- The demand for energy is increasing due to changing lifestyles, which require more energy for daily activities.
- The rise in the usage of machines and industrialization, driven by improved living standards, further escalates energy consumption.
- Fossil fuels, which are the primary source of energy currently, are non-renewable and take millions of years to form. Their reserves are limited, making them unsustainable in the long run.

**2. Harnessing Energy from the Sea:**
...