2. Briefly introductionBriefly introduction
It took the steely determinationIt took the steely determination
and perseverance of oneand perseverance of one
individual to arouse and uniteindividual to arouse and unite
the passions of nearly 20the passions of nearly 20
million Americans thatmillion Americans that
culminated into the creation ofculminated into the creation of
Earth Day. More importantly, itEarth Day. More importantly, it
finally put the need to urgentlyfinally put the need to urgently
harness and limitharness and limit
environmental decadence,environmental decadence,
before things reachedbefore things reached
irreversible extents.irreversible extents.

3. The Earth’s Day “Prophet”The Earth’s Day “Prophet”
Gaylord Nelson, (June 4, 1916 – July 3, 2005) Senator ofGaylord Nelson, (June 4, 1916 – July 3, 2005) Senator of
Wisconsin, is the principal founder of Earth Day. HeWisconsin, is the principal founder of Earth Day. He
managed to rip off the blindfolds of politicians, forcing themmanaged to rip off the blindfolds of politicians, forcing them
to see how the earth was needed immediate help toto see how the earth was needed immediate help to
recuperate after being made subject to industrial raperecuperate after being made subject to industrial rape

4. 11stst
demonstrationdemonstration
The first demonstration tookThe first demonstration took
place on April 22, 1970,place on April 22, 1970,
sponsored by Senatorsponsored by Senator
Gaylord Nelson andGaylord Nelson and
environmental activist, toenvironmental activist, to
create an environmentalcreate an environmental
agency. In this competitionagency. In this competition
there were two thousandthere were two thousand
universities, ten thousanduniversities, ten thousand
primary and secondaryprimary and secondary
schools, and hundreds ofschools, and hundreds of
communities. Socialcommunities. Social
pressure had itspressure had its
achievements and the U.S.achievements and the U.S.
government created thegovernment created the
Environmental ProtectionEnvironmental Protection
Agency (EPA) and a seriesAgency (EPA) and a series
of laws designed to protectof laws designed to protect

5. Earth SummitEarth Summit
In 1972, it was held the firstIn 1972, it was held the first
international conference oninternational conference on
the environment: the Earththe environment: the Earth
Summit in Stockholm, whichSummit in Stockholm, which
aimed to raise awarenessaimed to raise awareness
among world leaders on theamong world leaders on the
magnitude of environmentalmagnitude of environmental
problems. So this day isproblems. So this day is
celebrated world wide.celebrated world wide.

6. Only one day?Only one day?
Shouldn’t it be all theShouldn’t it be all the
year? Advances inyear? Advances in
technologytechnology
nowadays arenowadays are
trying to get ourtrying to get our
necessitiesnecessities
satisfied, butsatisfied, but
without harming thewithout harming the
environment.environment.

7. RENEWABLE ENERGYRENEWABLE ENERGY
Renewable energy is an energy which comesRenewable energy is an energy which comes
from natural resources suchfrom natural resources such
as sunlight, wind, rain, tides, and geothermal heat.as sunlight, wind, rain, tides, and geothermal heat.

8. Wind PowerWind Power
Wind power is theWind power is the
conversion of wind intoconversion of wind into
a useful form of energya useful form of energy..

9. Example:Example:

10. HydropowerHydropower
Hydropower or waterHydropower or water
power is power derivedpower is power derived
from the energy offrom the energy of
falling water.falling water.

11. Example:Example:

12. Solar energySolar energy
Solar energy is the energy the sunSolar energy is the energy the sun
creates, which can be transformedcreates, which can be transformed
into a useful form of energy.into a useful form of energy.
There are two types: Photovoltaic (PV)There are two types: Photovoltaic (PV)
and Solar thermal energy (STE).and Solar thermal energy (STE).

13. Photovoltaic (PV)Photovoltaic (PV) Photovoltaic is a method forPhotovoltaic is a method for
generating electric powergenerating electric power
by using solar cells toby using solar cells to
convert energy from theconvert energy from the
sun into a flow of electrons.sun into a flow of electrons.
Photovoltaic powerPhotovoltaic power
generation employs solargeneration employs solar
panels composed of apanels composed of a
number of solar cells.number of solar cells.
The first practical applicationThe first practical application
of photovoltaic was toof photovoltaic was to
power orbiting satellitespower orbiting satellites
and other spacecraft.and other spacecraft.

14. Solar thermal energy (STE)Solar thermal energy (STE)
Solar thermal energy is aSolar thermal energy is a
technology for transformingtechnology for transforming
solar energy into thermalsolar energy into thermal
energy (heat).energy (heat).

15. Geothermal energyGeothermal energy
Geothermal energy is heat fromGeothermal energy is heat from
within the Earth. We canwithin the Earth. We can
recover this heat as steam orrecover this heat as steam or
hot water and use it to heathot water and use it to heat
buildings or generatebuildings or generate
electricity.electricity.
Naturally occurring areas ofNaturally occurring areas of
hydrothermal resources arehydrothermal resources are
called geothermalcalled geothermal
reservoirs. Most of them arereservoirs. Most of them are
deep underground with nodeep underground with no
visible clues showing abovevisible clues showing above
ground.ground.

16. Example:Example:
Volcanoes and fumaroles, hot springs and geysers.Volcanoes and fumaroles, hot springs and geysers.

17. Biomass energyBiomass energy
Biomass is organic materialBiomass is organic material
made from plants andmade from plants and
animals (microorganisms).animals (microorganisms).
Biomass contains storedBiomass contains stored
energy from the sun thatenergy from the sun that
can be converted to othercan be converted to other
useable forms of energy,useable forms of energy,
such as methane gas orsuch as methane gas or
transportation fuels.transportation fuels.

18. Example:Example:

19. EnvironmentalEnvironmental friendly technologyfriendly technology
Technology is one of the things that helps us, but at theTechnology is one of the things that helps us, but at the
same time one which affects most the environment. Sosame time one which affects most the environment. So
Inventors don’t waste time putting their ideas in theInventors don’t waste time putting their ideas in the
service of the planet, taking them from imagination toservice of the planet, taking them from imagination to
reality. Green inventions were born to change our livesreality. Green inventions were born to change our lives
and save our environment. This are a class of electronicand save our environment. This are a class of electronic
devices that can promote sustainable management ofdevices that can promote sustainable management of
resources, which means to contribute to theresources, which means to contribute to the
environmental sustainability.environmental sustainability.