Global Climate Change: The Evidence

1
Global Climate Change The Evidence

• Presentation by Rosa Jaime

2
Human activities can effect the climate change.
Here are some changes that have happened in
recent times

• Raise in carbon dioxide co2
• Species extinction
• Nitrogen gasses have risen
• Massive increase in human population

3
Climate and What Controls It

• Sun
• Tilt of the earths axis
• The orbit of the earth around the sun
• Changes in geography
• Energy input from the sun and how it is
  redistributed and outputted into space
• Climate changes when input, redistribution, or
  output factors change, this is called forced
  behavior

4
Climate

• The reasonable expectations and possibilities of
  temperature and seasonality is climate
• Climate change is a shift in these possibilities
  and expectations

5
Climate Models

• Mathematical summaries about the mechanisms of
  the climate system (they are not chances or
  estimates)
• They reproduce main features of modern climate
• They capture changes in ice ages (in time and
  geographically)

6
Greenhouse Effect

• Greenhouse gasses are
• Carbon dioxide
• Methane
• Water vapor
• Nitrogen oxide
• These four gasses plus CFCs have been directly
  increases by humans

7
Feedbacks

• Water vapor feedbacks
• Warmer atmosphere is wetter
• Green house gas ()
• Cloud Radiation
• Reflect solar radiation (-)
• Absorb heat ()

8
Closing Facts

• Ocean warming is big evidence
• Common patterns show late 20th/early 21st
  centuries as the warmest
• Large, unprecedented increases in co2 and other
  greenhouse gasses
• Expect great climate change and global warming