Global Climate Change (AQA GCSE Chemistry: Combined Science)

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What are the effects of climate change?

  • The vast majority of climate scientists agree that increasing levels of greenhouse gases are causing the average temperature of the Earth to increase
  • Temperature increases are leading to climate change
  • Climate change is when there is a long term shift in worldwide weather patterns and conditions

Rising Sea Levels

  • The melting of the polar ice caps and glaciers is leading to rising sea levels
  • This results in destructive erosion to coastal regions, flooding of wetlands and habitat destruction for birds, fish and plants
  • Low lying cities are likely to see increased flooding and permanent loss of usable land without expensive barrier systems
  • Increased soil salinity is also a consequence of rising sea levels

Frequent and intense droughts

  • Some regions are seeing devastating droughts leading to crop failure and collapse of agricultural production
  • Food production is greatly compromised leading to hardship and starvation

Storms

  • The intensity of storms is increasing
  • Warmer ocean surfaces mean more moisture is entering the atmosphere so storms and hurricanes are more energetic and destructive

Extreme heat waves and rainfall

  • Extreme weather events are becoming more frequent resulting in great loss of life and destruction of infrastructure and ecosystems
  • Changing rainfall patterns are leading to uneven distribution of freshwater supplies
    • Lack of reliable freshwater supplies results in economic and political instability as neighbouring countries compete for dwindling resources

Examiner Tip

You should be able to discuss four effects of climate change.

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Stewart

Author: Stewart

Expertise: Chemistry Lead

Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.