Green Roofs - Living Architecture Monitor - Winter 2017 - 28

level. An example of a compounding effect is the increased
efficiency of solar PV located on
a green roof because of lower
rooftop temperatures. Additionally, many potentially significant
benefits were not quantified
due to lack of available data in
the area, making the value of
benefits reported a conservative
one. The main categories of
impacts quantified in this report
include energy and greenhouse
gases, financial incentives,
stormwater, health, climate
change and employment.
As buildings are cooled and
shaded by green roofs, they
require less energy for climate
control. Rooftop PV also lowers
energy bills at the individual
building level. City-wide cooling efforts result in widespread
lower temperatures, reducing
energy costs. Rooftop PV also
reduces demand during peak

energy periods, requiring fewer
peaking energy plants to be
built. Many cities also award
financial incentives for installing
the technologies analyzed in
the report through renewable
portfolio standards, renewable
energy credits and other tax
credits. Additionally, reduced
greenhouse gas usage slows the
onset of climate change.
Excess stormwater runoff
can result in localized flooding,
sewage overflows, and damage
to local water bodies. Decreased
total runoff from green roofs and
urban trees relieves pressure on
stormwater systems and protects
local water bodies from pollution.
The health impacts of citywide deployment are widespread
and indirect. Reduction in the
production of ozone and particulate matter by using renewable
energy, lowering temperatures,
and planting trees to filter air

LIVING ARCHITECTURE MONITOR / WINTER 2017 / 28

can significantly improve air quality. Additionally, incidence of heat
stress and related illnesses could decrease by lessening the occurrence
of extreme heat events. Improving the health of a city's population
saves money by reducing the number of unreimbursed hospital visits.
Current work is being done to expand the report further, especially
focusing on benefits to health as the percentage of GDP spent on
healthcare climbs higher than the current 17% in the United States.
Finally, building and maintaining green infrastructure has the
potential to create new employment opportunities. Labor intensity of
green energy is higher than conventional energy sources. The World
Bank estimates that wind, solar and energy efficiency retrofits create
more than 3 times the number of jobs per investment than oil and
natural gas.
Obviously, the benefits of city-wide smart surface deployment are
broad and significant. This study can be used to drive cities in the
United States toward comprehensive steps to enhance resilience and
health as well as decarbonization backed by informed cost-benefit
analysis at the city-wide scale for the first time. Outside of the US as
developing countries modernize and improve cities with cost-benefit
analyses in mind, green strategies have the potential to become the
norm, not the exception when backed by comprehensive analyses like
the Kats' report.
Rachel Lempp is an intern with Capital E Investments and Greg Kats is
the Managing Director of ARENA INVESTMENTS and the President of
Capital E Investments. For more information visit: www.cap-e.com

LIVINGARCHITECTUREMONITOR.COM


http://www.cap-e.com http://www.iranalyzers.com

Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Winter 2017

Green Roofs - Living Architecture Monitor - Winter 2017 - IP
Green Roofs - Living Architecture Monitor - Winter 2017 - Cover1
Green Roofs - Living Architecture Monitor - Winter 2017 - C
Green Roofs - Living Architecture Monitor - Winter 2017 - TOC
Green Roofs - Living Architecture Monitor - Winter 2017 - D
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Green Roofs - Living Architecture Monitor - Winter 2017 - M1
Green Roofs - Living Architecture Monitor - Winter 2017 - A1
https://www.nxtbook.com/dawson/greenroofs/lam_2020Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2020Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2020Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2020Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2019Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2019Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2019Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2019Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2018winter
https://www.nxtbook.com/dawson/greenroofs/lam_2018Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2018summer
https://www.nxtbook.com/dawson/greenroofs/lam_2018spring
https://www.nxtbook.com/dawson/greenroofs/lam_2017winter
https://www.nxtbook.com/dawson/greenroofs/lam_2017fall
https://www.nxtbook.com/dawson/greenroofs/lam_2017summer
https://www.nxtbook.com/dawson/greenroofs/lam_2017Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2016winter
https://www.nxtbook.com/dawson/greenroofs/lam_2016fall
https://www.nxtbook.com/dawson/greenroofs/lam_2016summer
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https://www.nxtbook.com/dawson/greenroofs/lam_2015Winter
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https://www.nxtbook.com/dawson/greenroofs/lam_2015summer
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https://www.nxtbook.com/dawson/greenroofs/lam_2014winter
https://www.nxtbook.com/dawson/greenroofs/lam_2014fall
https://www.nxtbook.com/dawson/greenroofs/lam_2014summer
https://www.nxtbook.com/dawson/greenroofs/lam_2014spring
https://www.nxtbook.com/dawson/greenroofs/lam_2013winter
https://www.nxtbook.com/dawson/greenroofs/lam_2013fall
https://www.nxtbook.com/dawson/greenroofs/lam_2013summer
https://www.nxtbook.com/dawson/greenroofs/lam_2013spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012fall
https://www.nxtbook.com/dawson/greenroofs/lam_2012summer
https://www.nxtbook.com/dawson/greenroofs/lam_2012spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012winter
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https://www.nxtbook.com/dawson/greenroofs/lam_2009winter
https://www.nxtbook.com/dawson/greenroofs/lam_2008fall
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