Temp rise

• Why are temp records from past unreliable?

  • Thermometers have changed over time
  • So cant draw conclusions
  • About global temp rise
  • Due to anthropogenic reasons
• Greenhouses gases e.g. CO2 contribute to global warming. How is CO2 released into atmosphere?

  • Burning of fossil feuls
  • Destroy forests(carbon sinks)
  • Trees are burnt
  • Decomposers respire
• Greenhouses gases e.g. CH4 contribute to global warming. How is CH4 released?

  • Cattle give off methane gas
  • Decaying waste (decomposers respire anearobically)
  • Melting of permafrost