7. CAUSES
• Inadequate design of lamps and projectors.
• Incorrect installation of lamps and spotlights, emitting light
far beyond its target or zone of influence, without any useful
effect.
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8. CONSEQUENCES
• Waste of energy
• Waste of money
• Air pollution
• Impact on living beings
• Obstacle to astronomical observations.
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10. LIGHT POLLUTION AND WILDLIFE
• Animals and plants live
according to the 24-hour cycle
of our planet.
• Humans can feel a change in
their circadian rhythm when
traveling by air between places
with different time zones. This
change is characterized by
drowsiness, lethargy, or a
general feeling that something
is not right.
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11. LIGHT POLLUTION AND WILDLIFE
• The animals behaviors are also affected when exposed to too
much artificial light at night.
• Behaviors affected by light pollution:
• migration;
• sleep;
• food searching.
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12. LIGHT POLLUTION - MAMMALS
• The bright lights of cities and towns harm mammals worldwide, through
the loss of his nocturnal ecosystem. Examples of affected mammals are
bats, raccoons, wolves, deer and elk. These species may be subjected
to:
• decline in reproduction leading to population decline;
• difficulty in finding food due to excessive brightness;
• exposure to predators who would be otherwise unable to see them;
• mortality increasement, caused by the weakening of eyesight.
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13. LIGHT POLLUTION- BIRDS
• http://vimeo.com/54089280
• Many species of birds migrate or hunt at night.
• This dependence of darkness makes them extremely
vulnerable to bright lights in areas that are naturally dark.
The birds can be attracted to the light sources and stay
fixed in the light beam.
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14. LIGHT POLLUTION - BIRDS
• Light pollution is a major threat to birds, especially seabirds by the time the juveniles
leave the nests.
• The birds are attracted by the lights, get blinded and collide with buildings, power
lines and vehicles, that are increasing in coastal areas due to urban and industrial
development.
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15. LIGHT POLLUTION - BIRDS
• Every year about 100 million birds in North America die in collisions with lighted buildings
and towers;
• Not wanting to fly back to the darker areas, the birds continue to fly toward the spotlight
until they are exhausted, fall, or finded by a predator;
• Artificial lights can still take migratory birds out of their route, not reaching its natural
destiny;
• Seabirds collide with the headlights, wind turbines and floating platforms at sea.
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16. LIGHT POLLUTION - REPTILES
• Reptiles are strongly affected by
light pollution.
• Sea turtles like to build their
nests in remote and very dark
beaches.
• Coastal lights interfere with their
ability to find safe nesting areas
for their eggs.
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18. LIGHT POLLUTION- REPTILES
• Artificial lights can confuse the
baby turtles and take them to
crawl away from the ocean into the
roads or communities.
• If they don’t find their way back to
the ocean, they get exhausted or
dehydrated and die.
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19. SOCIAL AND HEALTH EFFECTS
• The light enters by the windows. It causes fatigue, insomnia and stress.
• Harms public safety, since the powerful light can cause temporary blindness
for drivers of vehicles.
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23. • We could also illuminate the same area using a lower
wattage lamp
• We can do even better, using more efficient reflector and
energy lamps, with even greater savings.
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