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Analyse the Impact of Humans on Biodiversity

In this worksheet, students will analyse how humans have impacted global environments.

'Analyse the Impact of Humans on Biodiversity' worksheet

Key stage:  KS 4

Year:  GCSE

GCSE Subjects:   Biology: Single Subject, Biology: Combined Science,

GCSE Boards:   OCR 21st Century

Curriculum topic:   Life on Earth: Past, Present and Future

Curriculum subtopic:   How is Biodiversity Threatened and How Can We Protect It?

Difficulty level:  

Worksheet Overview

Every ecosystem around the world is bursting with life.

Everywhere you look, you can see communities of different species sharing habitats and relying on each other for resources to survive.


This is called biodiversity: when many different species live together in an ecosystem.


Planet Earth


The higher the biodiversity, the more types of species cohabit and the more stable the ecosystem.


As coexisting creatures and plants rely on each other, having a large variety of species is essential.




As the Earth is one large ecosystem, this applies to us too, meaning that human survival depends on protecting our environment so that it stays stable enough to provide for us!


So let’s put all these pieces together:




The smallest change to one creature can affect all the other creatures around them, like in a food chain, so preserving nature should be a key responsibility for humans, especially as a lot of damage is our fault.


While environmental awareness is increasing, humans have already damaged the world in three major ways:


Human impact on the environment


Deforestation provides land for farming and housing, but fewer trees means fewer habitats and less carbon dioxide gas being absorbed from the atmosphere, destabilising the planet.


The rising human population and higher standards of living, mean more waste, creating toxic pollution that reduces biodiversity, leaving the remaining species with less food and fewer resources to choose from.


Sewage and fertilisers have polluted our water, toxic gases and smoke are causing air pollution, and landfills are damaging land, along with toxic chemicals - basically, humans are messy!


And the one we’re all feeling - global warming! More carbon dioxide and methane in the atmosphere is heating the planet through the greenhouse effect, and the hotter the planet gets, the more biodiversity suffers.


Ultimately, if habitat destruction, environmental changes and the introduction of more foreign species continues, extinction is a very real possibility!


Pollution from rubbish


We are getting better at helping the planet, but tackling reduced biodiversity locally and globally is a challenge. 


The financial burden of new programs and the risk of mass unemployment by terminating eco-unfriendly jobs, are putting a huge strain on productive change. 

Also, as the population increases, more housing is needed, but the cost of development means more natural habitats have to be destroyed for our sake. So remember:






But despite the controversy, some measures are seeing great success.


Ecotourism aims to minimise the impact of humans on natural habitats as a sustainable concept, making sure that any new building work benefits the locals, as well as tourists.

It also makes sure that local communities have a say in how their environment and their way of life might be impacted by tourism, to minimise exploitation.


So let's hope that humans continue to enforce more positive and sustainable ways to conserve biodiversity!


Now it's time for some questions!

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