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Ecology in Action

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Reduce the “urbanheat island efect”

Reduce amount ogreenhouse gas

Provide more spaceor agriculture

Reduce and cleanstorm water runof 

Reduce energyconsumption

Increase the beautyo cities

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A phenomenon in which the ambient air temperature in

cities is higher than in its surrounding suburban andrural areas

Causes:

Materials (such as concrete and asphalt) absorb andradiate more heat than natural surfaces found in ruralsettings

Tall buildings - more surfaces that reect and absorb lightand bloc wind

!aste heat from energy usage " includes cars# airconditioning# industries

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 Transer o heat by direct contact oparticles in matter

In solids, close vibration o atomsnext to each other

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 Transer o heat by uid or gas movingacross a boundary

!atural convection occurs bybuoyancy orces

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 Transer o thermal energy through space  This is how the sun heats the surace o the

"arth#

Radiation can be transmitted, reected and

emitted rom a surace

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Insulators$ materials that reduce the rate o heattranser

%bsorbers

$ materials that ta&e up the energy o light Reectors

$ materials that change the direction o lightwaves

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%ll colors absorb light andreect only thewavelengthso their color

'hite reects allwavelengths o light

(lac& absorbs allwavelengths o light

 The energy o the absorbed light istranserred into heat energy)

 (lac& suraces get hotter than other

colors#

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Provide an alternative to commonroo materials

%bsorb *+, and sunlight during

photosynthesis *reate shade

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Photosynthesis- how plants eed themselves +ccurs in the leaves o plants

Represented by the e.uation-

/ses carbon dioxide and energy rom the sun

Produces oxygen

%dditional bene0t- Photosynthesis helpsreduce global warming by convertingcarbon dioxide molecules 1a greenhousegas2

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*ondition o the roo 

3tructural capacity o the roo 

%ccess to the roo 

*ost

Irrigation

4rainage

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 This demonstration plot on a sidewal&in Portland, +R, shows the exactcomposition o the “green roo” on the

building above it5

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6easure the temperaturesinside and on the roo o the

buildings while under a heatlamp 1sun2

7raph the data

 Team ob8ectives- *onstruct two identical

model buildings %ne with a blac tar

roof  %ne with a rooftop

garden

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