Describe the consequences of an increase in carbon dioxide for the world’s ecosystems (6 mark exam question)
- Increased greenhouse gases
- Greenhouse effect - trapping infrared heat
- Leads to global warming and an increase in temperature
- Leads to melting ice caps; rising sea levels; flooding
- Leads to drought; climate change and extreme weather (e.g. storms)
- Leads to loss of habitat
- Leads to acidification and desertification
- Leads to extinctions; food chain disruption and less biodiversity
- Can lead to migration; change in distribution; spread of disease / spread of pests
Adds carbon dioxide to the air.
Chemical change that takes place inside living cells, Uses glucose and oxygen to produce the energy organisms need to live.
Removes carbon dioxide from the air.
A chemical process used by plants and algae to make glucose and oxygen from carbon dioxide and water, using light energy.
Oxygen is produced as a by-product.
Break down of anime and plants (dead or waste) materials by bacteria or fungi.
Adds carbon dioxide to the air. The process of burning to produce heat.
Decrease in the pH of the Earth’s oceans, caused by the uptake of carbon dioxide from the atmosphere
When fertile land becomes desert, usually as a result of drought or deforestation
Seasonal movement of animals from one region to another
The Earth becomes hotter as a result of increased greenhouse gases.
Can lead to climate change.
climate change - a long period of none or low rainfall, leading to a shortage of water
- The Sun’s rays enter the Earth’s atmosphere
- Heat is reflected back from the Earth’s surface
- This heat is absorbed by greenhouse gases and as a result becomes trapped in the Earth’s atmosphere
- The Earth becomes hotter as a result and can lead to global warming and climate change.
Carbon dioxide, water vapour, methane and nitrous oxide are all greenhouse gases
How can we reduce the amount of carbon dioxide being released into the atmosphere? (Exam question)
- Reduce the use of fossil fuels (coal / oil / natural gas)
- Use nuclear energy
- Use renewable energy sources - such as: wind; sun; hydroelectricity; waves; today; geothermal.
- Plant more trees / reduce deforestation / grow more plants
- Use public transport / cycle / trains / fewer cars / electric cars;
The variety of plant and animal life in the world or in a particular habitat
Removal of trees / forests.
Means that less carbon dioxide is absorbed from the atmosphere.
How does deforestation affect the carbon cycle? (Exam question)
2. more carbon dioxide in air / less carbon dioxide absorbed;
3. less consumption of plants / eq;
4. less decomposition / decay;
5. burning of trees produces carbon dioxide;
Water, from rain, snowmelt, or other sources, that flows over the land surface
The process in which a gas (water vapour) turns into a liquid (water) by cooling.
As water droplets in clouds get bigger and heavier, they begin to fall as rain, snow and sleet
The process in which a liquid (water) turns into a gas (water vapour) by heating.
The evaporation of water vapour
From the leaves of a plant
Through the stomata
Explain the possible consequences of deforestation for the water cycle. (Exam question)
less transpiration / less water loss from plants / eq; 2. less cloud formation / condensation; 3. less precipitation / rain / less water falls on the ground / eq;
Non renewable fuels made from the remains of living organisms
Heat and pressure produces fossil fuels over millions of years
Coal, Oil and Natural gas (methane)