The statement "Humanity uses a little less than half the water available worldwide" is not entirely accurate. Here's a more precise breakdown:

1. **Total Water on Earth**: Approximately 71% of the Earth's surface is covered by water, but most of this is saltwater (about 97.5%).

2. **Freshwater Availability**: Only about 2.5% of the Earth's water is freshwater, which is essential for human use, agriculture, and ecosystems.

3. **Usable Freshwater**: Of this 2.5% freshwater, only a small fraction is readily accessible and usable:
- Surface water (rivers, lakes)
- Shallow groundwater

4. **Actual Water Usage**: According to various sources, humanity currently uses approximately 26-28% of the world’s total renewable freshwater supply, not nearly half.

Therefore, it would be more accurate to say that humanity uses about a quarter to a third of the world's total renewable freshwater supply, rather than "a little less than half."