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>>> A thing that they are good at however, is lowering temperatures in cities

Plants are not magical, so if they get the same solar light influx then: (choose at least one)

a) They are actually not good keeping the temperature down?

b) The have more reflectivity, i.e. they are more white? (but I think they are darker)

c) The complex structure provides some air flow that keep the plant and soil cooler? (like the isolation of fur in animals, but in the other direction)

d) The specific heat of plants is greater than concrete? (plants have more water, and water has a big heat capacity)

e) The big heat capacity is due not to the water in the plant, but to the water in the soil?

f) The difference of temperature is caused by transpiration of the plant? (water has a huge heat of vaporization, plants try not to loos too much water in transpiration anyway)

g) Most of the evaporation is water that was in the soil?

For f) and g) two you need irrigation. Perhaps not daily because plants and soil are better storing water than concrete, but it is the same amount of water.

For d) and e), you need less irrigation, but perhaps it is better to have some kind of water tank of pipes, to avoid water lose.

For c) you can try with artificial grass. Does it work? Is it easier to maintain?

For b) it is probably better to use and aluminium foil cover (they are popular here it rooftop to avoid rain leaks)



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