Climate change is causing negative effects like changing seasons that allow diseases to spread farther north, changing rainfall patterns, and more frequent/intense hurricanes, tornadoes, and floods. Higher temperatures are warming oceans and allowing hurricanes to be stronger and more destructive. Climate change also threatens global food supply by potentially reducing crop yields through more droughts and floods, and could lead to food shortages and famine in poorer regions if harvests decline. Coastal cities face flooding risks from rising sea levels.

1. Negative Effects of Climate
Change

2. Changing length of seasons – as global temperatures rise
diseases that are normally only found in hot counties are
beginning to be found further north for example, Italy is now
having to deal with Malaria.

3. Changing patterns of rainfall

4. More frequent, stronger hurricanes,
tornadoes and flash floods

5. More frequent, stronger hurricanes,More frequent, stronger hurricanes,
tornadoes and flash floodstornadoes and flash floods
• Hurricanes only form over seas that are above 27oC.
• As global temperatures rise, so does the
temperature of the sea. This means that a larger area
of the ocean now produces hurricanes.
• This will cause not only an increase in number but
also an increase in intensity making the hurricanes
larger and more destructive with stronger winds.

6. Reduction in agricultural output - flood

7. Reduction in agricultural output -
drought

8. Reduction in agricultural outputReduction in agricultural output
• The worlds most important foods are rice and wheat and
these are grown only in certain places around the world.
• The USA, Canada and Russia are known as the ‘wheat belt’.
• These countries are likely to experience changes to climate
but it is not clear if the impact will be positive or not.
• Almost every country in the world depends on food imports
and at any moment the world has about 40 days worth of
food in store.
• If climate change reduces harvests then food prices will rise
and some poorer nations will be unable to afford the cost of
food leading to famine, especially sub-Saharan Africa (the
area of Africa south of the Sahara desert).

9. Flooding of low lying cities

10. Flooding of low lying citiesFlooding of low lying cities

11. One negative effect of climate change is the
retreat of glaciers. Explain two other negative
effects of climate change (6 marks)