The document discusses the greenhouse effect and global warming. It explains that the greenhouse effect is a natural phenomenon that is necessary to maintain temperatures on Earth but human activities are interfering with this effect by increasing greenhouse gases. This leads to global warming, raising the average surface temperature of the planet. The key greenhouse gas contributing to global warming is carbon dioxide and some of the risks of rising global temperatures include rising sea levels, more extreme weather events, changing wind patterns, and damage to coral reefs and agriculture.

1. Twitter: @LilyKotze

2. natural phenomenon.
The greenhouse effect is a
It is necessary for life on earth.
Without it, the average
temperature on earth
(15 °C), would be about
30 °C lower at -15
degrees.

3. Earth
Venus
Mars
All planets with an
atmosphere have a
greenhouse
effect.

4. Water vapour
(H2O)
Nitrous oxide (N2O)
Carbon
dioxide (CO2)
Methane (CH4)
Greenhouse gases capture the infrared rays that
warm the air closest to earth. These gases,
pictured, absorb the heat radiated from the
earth. This radiated energy heats the earth.
This energy cannot
escape the
atmosphere.

5. Human activities interfere with the natural
greenhouse effect: causes an increase in
greenhouse gases, which leads to global warming.

7. Definition: Global Warming

8. Since 1987, solar
activity has been
declining. Under these
conditions we should
see some cooling of
average temperatures
but instead global
warming continues to
rise.
Today, the Earth is in
the part of the orbit
where it is less exposed
to the Sun. However,
temperature records
show a sudden and
steep increase of
average surface
temperatures.
Volcanic eruptions
emit carbon dioxide
(CO2) into the Earth’s
atmosphere. Yet,
humans create 146
time more CO2 than
volcanoes each year.
But natural causes cannot be causing current global warming.

9. It is commonly accepted that most of the rise in
the average temperature of the earth over the
last 50 years is due to human activities.

10. The greenhouse gas that
contributes the most to
global warming.:

11. Effects of global
warming

12. Rising world temperatures pose risks to life on earth.

13. Rising sea levels
Destruction
of coral
reefs
Change in
agricultural
yields
Change in
wind
systems
Changing
ecosystems

14. Changing
wind systems
Coastal
flooding
Extreme
precipitation
events
Droughts
Heat waves
Heat waves
and droughts
lead to un-
controllable brush
Fires.

15. Healthy coral Dead coral

16. To summarise

20. Title slide: http://i1-news.softpedia-static.com/images/news2/A-New-Explanation-of-
Global-Warming-2.jpg
Slide 2: https://globalfreezingyourassoff.files.wordpress.com/2013/12/ice-age.jpg
Slide 3; Earth: http://cdn.wonderfulengineering.com/wp-content/uploads/2014/06/earth-
wallpapers-16.jpg ; Mars: http://innovativeisrael.dk/wp-
content/uploads/2013/05/Mars.jpg ; Venus: http://www.seasky.org/solar-
system/assets/images/venus02_sk12.jpg
Slide 4: http://climate.nasa.gov/system/internal_resources/details/original/249_Causes-
greenhouse-gas-molecules-cropped-more-55.jpg
Slide 6: http://i.livescience.com/images/i/000/053/475/original/Greenhouse-
effect.jpg?1370382117
Slide 7: http://blog.heartland.org/wp-content/uploads/2012/09/earthmelting.jpg
Slide 8: facts: http://media.whatsyourimpact.org/style/cc-not-natural.png ; thermometer:
http://trustworks.files.wordpress.com/2013/06/thermometer.jpg ; earth:
http://www.wbdaily.com/wp-content/uploads/2014/12/earth-with-shimmer.jpg ; balance
scales: http://mariashriver.com/wp-content/uploads/drupal/Scales.png
Slide 9:
http://apps.startribune.com/blogs/user_images/pauldouglas_1427827751_emissions.jpg
Slide 10: https://postmediavancouversun.files.wordpress.com/2012/02/global-
warming1.jpg
Slide 12:
http://assets.climatecentral.org/images/made/9_26_13_andrew_decadesofwarming_1050
_591_s_c1_c_c.jpg

21. Slide 13: Rising sea level: http://www.futurosostenibile.org/wp-
content/uploads/2014/10/sea_level_rising.jpg ; Change in wind systems:
http://katietalkscarolina.com/wp-content/uploads/2012/02/Wind-Quotes4.gif ; Changing
ecosystems: http://blog.conservation.org/wp-content/uploads/2010/06/penguins.jpg ;
destruction of coral reefs: http://cdn.c.photoshelter.com/img-
get/I0000ifZe0SpgSBA/s/750/750/MPO00191.jpg ; Agricultural yields:
http://www.thecatholicfoundation.com/wp-content/uploads/2012/03/new-harvest.jpg :
Slide 14: http://katietalkscarolina.com/wp-content/uploads/2012/02/Wind-Quotes4.gif ;
coastal flooding: http://i.usatoday.net/weather/_photos/2011/11/18/Climate-change-
worsens-extreme-weather-events-6KJU9LG-x-large.jpg heat waves:http://www.gannett-
cdn.com/-mm-
/f40f3606fa7f520417c0c9e02d7aa7a371d004ba/r=x513&c=680x510/local/-
/media/USATODAY/USATODAY/2013/08/01/1375361962000-chinaheat080113-008-
1308010900_4_3.jpg ; extreme precipitation events:
https://www.irisglobal.org/images/news/uploads/780/mozambique-flood-toll-rises-
20130102__relief-gallery.jpg ; severe droughts:
http://media.salon.com/2011/12/climate-drought2.png ; fires:
http://www.ready.gov/sites/default/files/Wildfires%201.1.12.0%20Tab%201%20of%202.j
pg
Slide 15: healthy coral: http://nocamels.com/wp-content/uploads/2014/08/coral-reefs-
beautiful.jpg ; dead coral: : http://cdn.c.photoshelter.com/img-
get/I0000ifZe0SpgSBA/s/750/750/MPO00191.jpg
Slide 16: http://www.bom.gov.au/state-of-the-climate/images/fig9.jpg

22. Slide 17:
http://www.cdc.gov/climateandhealth/images/climate_change_health_impacts600w.jpg
Slide 18 & 19:
http://www.wwa.winacc.org/sites/default/files/Leafleat%20for%20screen_2.jpg