It's confusing phrasing. Increasing *evaporative* cooling by 0.5deg requires 3x more water, but shade alone is the *main* mechanism,it doesn't require water.

It's confusing phrasing. Increasing *evaporative* cooling by 0.5deg requires 3x more water, but shade alone is the *main* mechanism,it doesn't require water. >during the day, trees provide significant shade by intercepting solar radiation, reducing mean radiant temperature (up to 16 °C)