4.7.3.5 Global Warming

Question 1

Global warming:

Answer 1

• the fact that temperatures around the world are increasing
• due to increases GHG emissions resulting in more heat being absorbed and trapped by the ozone layer and being reflected back to the Earth → heating up the Earth

Question 2

Biological consequences of global warming:

Answer 2

• melting of ice caps → habitat loss
• rising sea levels - > reducing habitats as low-lying areas will be flooded with salty water
• temperature and rainfall levels will affects migration and therefore the distribution of different species → as they may no longer be able to survive where they live
• organisms will become extinct as their habitats are lost - reducing biodiversity

Question 3

What is contributing to ‘global warming’?

Answer 3

• levels of carbon dioxide and methane in the atmosphere are increasing
• this contributes to ‘global warming’