4. greenhouse effect

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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.

Earth

Venus

Mars

All planets with an atmosphere have a greenhouse effect.

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.

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

warming.

The increase in the average temperature of the earth’s atmosphere and oceans.

Definition: Global Warming

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.

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.

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

Effects of global warming

Rising world temperatures pose risks to life on earth.

Rising sea levels

Destruction of coral reefs

Change in agricultural yields

Change in wind systems

Changing ecosystems

Changing wind

systems

Coastal flooding

Extreme precipitation events

Droughts

Heat waves

Heat waves and droughts lead to un-controllable brush Fires.

Healthy coral Dead coral

To summarise

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

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.jpg 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.jpgSlide 16: http://www.bom.gov.au/state-of-the-climate/images/fig9.jpg

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