Source: https://www.youtube.com/watch?v=oJAbATJCugs

Global Warming is the phenomenon of gradually increasing average temperatures of Earth’s atmosphere and oceans, that threatens to bring Earth’s climates to extreme levels.

Source: http://www.livescience.com/37003-global-warming.html

Causes

• Human activities
  • Deforestation
  • Burning of fossil fuels (to generate energy)
• Natural processes
  • Respiration
  • Volcanic eruptions
  • Solar radiation

Source: http://science.howstuffworks.com/environmental/green-science/global-warming2.htm

Source: http://www.livescience.com/topics/global-warming/

These activities and processes result in the production of huge amounts of carbon dioxide (CO₂), a heat-trapping greenhouse gas that increases global surface temperatures. Extreme cold temperatures have also been seen in some states, an explained occurrence that scientists link to global warming as well.

Source: http://climate.nasa.gov/evidence/

Consequences

• Melting ice caps and glaciers lead to rising sea levels and subsequently floods
• Animal habitats destroyed (e.g. Great Barrier Reef in Australia) and subsequent migration of animals lead to overcrowding
• Fluctuating weather patterns lead to natural disasters like tornadoes and snowstorms
• Droughts lead to decreased agricultural output and subsequently increased global hunger levels
• Displacement of populations living near coastlines
• The large amount of CO₂ absorb by ocean leads to ocean acidification