Unit 2: Sustainable Development

Scientists have accumulated so much evidence in the theory of evolution that it is one of the most widely-accepted theories in science.

Ever wonder how fish survive in the cold waters of the Arctic and Antarctic? It’s partly because of a brilliant evolutionary adaptation.

Make a model of the water cycle and find out how water moves around on planet Earth.

Biofuels like ethanol might help fight climate change. But they can contribute to food insecurity and greenhouse gases in ways that might surprise you.

Can carbon offsets help you reduce your environmental footprint, practice sustainable living and fight climate change?

This backgrounder explains what greenhouse gases are and how they contribute to climate change.

1 diagram illustrating the water cycle

Cloning makes it possible to bring extinct species back to life. But is that a good idea?

What's tasty, abundant and high in protein and vitamins? Bugs! Bugs feed about 2 billion people each day. They also hold promise for food security and sustainability.

The water in the oceans has travelled vast distances. It has even time spent deep below the surface of the Earth, trapped inside the mineral ringwoodite.

A study on bird feeders and beak sizes shows how an everyday human activity can affect the evolution of another species.

Take a closer look at food packaging. Explore why and how food is packaged in different ways.

Some dung beetles use alternative reproductive tactics to increase their chances of finding a mate. Learn what this tells us about evolution and biodiversity.

Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.

Aquaculture is seen as a sustainable way to produce fish. But are farmed salmon better than wild fish?