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Acid rain
Rain that is unusually acidic, with a pH less than 5. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract...
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Leaching
In agriculture, the loss of important nutrients from the soil, carried away when too much water flows through it. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Smog - City Air Pollution
From 'smoky fog', smog is a form of pollution often associated with cities. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Electricity: The Costs
Where does the electricity we use come from? Are we damaging our environment just to keep the lights on? Earth Science - Earth's Resources - Learning Points. Electricity is essential to our society and the way we live. Electricity...
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Factpack: Mercury in Food Chains
Discover how mercury travels through food chains, and how its concentration multiplies along the way. Biology - Ecosystems - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to...
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Abiotic Factors in Ecosystems
What happens when non-living factors in an ecosystem are altered, such as rainfall or air quality? Biology - Ecosystems - Learning Points. An ecosystem is a living system interacting with its physical habitat. Changes in biotic and...
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A History of Mass Extinctions
The cause and impacts of the five mass extinction events in Earth's history, and predictions for a sixth which could end human life. Biology - Adaptation And Evolution - Learning Points. Is Earth experiencing its six mass extinction, as...
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Pollution: Air
What are the major atmospheric pollutants and where do they come from? Discover what air pollution means for the environment and how it affects humans, from smog to acid rain. Earth Science - Human Impacts - Learning Points....
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Bottled Water: The True Cost
What is the expense, and environmental cost, of bottling water when tap water is freely available? Earth Science - Earth's Resources - Learning Points. Bottled water is up to 10,000 times more expensive than tap water. Bottled water has...
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Global Dimming
Even though the planet is warming, the amount of sunlight reaching the Earth's surface is decreasing. What is causing this, and what effect does it have? Earth Science - Human Impacts - Learning Points. Global dimming is the reduction in...
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The Carbon Family - Carbon Footprint
Welcome to the home of the Carbon family. Discover how much carbon they - and many average families - use every single year. Human Geography - A Changing World - Learning Points. 50% of CO2 produced by humans comes from...
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Lichen: Indicator Species
Lichens exist in extreme environments where other life struggles to survive. But these tough species cannot tolerate pollution, and reflect the health of ecosystems. Biology - Ecosystems - Learning Points. Lichens are organisms that can...
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Pollution: Land
How does land get polluted, and what with? Discover the quantities of waste deposited in landfills each year, and just how much could be recycled. Earth Science - Human Impacts - Learning Points. Landfills are holes in the ground where...
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Traffic Congestion
As car ownership increases around the world, so does global traffic congestion. What are the social and economic impacts of congestion, and what action can be taken to lessen the problem? Human Geography - A Changing World - 50 million...
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Oil Spills - Environmental Impact
Offshore oil spills can lead to decades of ecological harm for marine life. How can we clean-up oil spills and limit damage to the environment? Earth Science - Human Impacts - Learning Points. Offshore oil spills float on the surface of...
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Pollution: Water
How does water get polluted? Discover what water pollution means for the environment and how it affects humans. Earth Science - Human Impacts - Learning Points. Industry, agriculture and sewage all contribute to water pollution....
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Quarrying: Impacts
Quarries are found all over the world, providing employment and boosting local economies. What are the various economic, social and environmental impacts? Earth Science - Geology - Learning Points. Globally, rock such as granite, marble...
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Oceans: Coral Seas
Coral seas are the most colourful and diverse habitats on Earth, built from a unique symbiotic relationship between coral larvae and algae. Biology - Ecosystems - Learning Points. Coral reefs are found in warm, tropical oceans and are...
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Nuclear Power
How is this powerful and controversial energy source produced? Do the advantages outweigh the dangers of nuclear power? Earth Science - Earth's Resources - Learning Points. Nuclear power is created using uranium, and small amounts can...
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Fold Mountains: Uses
Fold mountains provide a challenge for humans in many ways. What are the uses of this terrain around the world? And how do these effect the environment of fold mountain ranges? Earth Science - Geology - Learning Points. The impressive...
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Global Warming
Earth has always had changeable weather, but now the world's climate is getting warmer. What is global warming, why is it a problem and how can we stop it? Earth Science - Human Impacts - Learning Points. Most scientists agree that human...
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The Ozone Layer
The world has already faced a major global climate challenge: the hole in the ozone layer, discovered in 1985. Find out what ozone is, why it's important, and how the ozone hole is being repaired. Earth Science - Human Impacts - Learning...
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Ecosystem Management: Tropical Rainforests
The Amazon rainforest is being cut down for resources and land at a rapid rate. Learn how alternative farming methods, incentives to cut carbon emissions and protected reserves are helping to conserve the rainforest from further harm....
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Mass Tourism: Case Study
Tourism is now a major industry in Thailand due to its rich culture and exotic climate. However, mass tourism puts extraordinary pressure on local resources and creates problems of overcrowding and pollution. How can Thailand manage...