Ecology and Sustainable Energy Notes

Why Are Natural Environments Important?

  • Importance to Individuals:

    • Health & Wellbeing: Clean air and water are essential for human survival. Natural areas reduce stress and improve mental health. Example: In Japan, “forest bathing” (shinrin-yoku) is a common activity where people spend time in forests to relax and reduce stress.

    • Food, Water, and Shelter: Crops and livestock depend on soil, rain, and healthy ecosystems. Forests provide wood for housing and tools. Example: In India, the Ganges River provides water for drinking, farming, and industry, supporting millions of people.

    • Recreation and Inspiration: People enjoy hiking, swimming, and exploring nature. Artists and cultures find inspiration in the natural world.

  • Importance to Societies:

    • Economic Value: Agriculture, fishing, and forestry are major industries. Nature tourism brings money and jobs (e.g., safaris, national parks). Example: In Kenya, national parks like Maasai Mara attract tourists from around the world, creating jobs in eco-tourism.

    • Cultural and Spiritual Value: Many cultures consider rivers, mountains, and forests sacred. Traditional knowledge is connected to land and resources. Example: In Australia, Aboriginal communities consider natural places like Uluru sacred and full of traditional stories.

    • Climate and Environmental Services: Forests absorb carbon dioxide and help fight climate change. Wetlands prevent floods by absorbing excess water. Oceans and forests regulate global temperatures. Example: The Amazon Rainforest is often called “the lungs of the Earth” because it absorbs huge amounts of CO²​.

How Do Different Environments Work as Systems?

Environments have ecosystems. The definition of an ecosystem is:

“Communities of living organisms within a specific environment that are interdependent.”

These ecosystems can be found in all of the biomes we have learned about in different areas of the biome:
Ponds
Rivers
Caves
Woodlands
Forests
Oceans
Deserts
Grasslands
Savannahs
Mountains
And more!

Organism

Description

Producer

Producers are the plants and vegetation within the ecosystem. Their type and quantity depend on the location of the ecosystem. They provide food for the consumers. Producers grow using sunlight, water, and nutrients from the ground.

Consumer

Consumers are the different species of animals within an ecosystem. They feed on plants (herbivores), animals (carnivores,) or both (omnivores). Consumers can be split into two further categories primary and secondary.

Primary Consumer

Primary consumers are typically herbivores that feed off plants.

Secondary Consumer

Secondary consumers are usually carnivores that feed off the primary consumers.

Apex Predator

In a food web the number of consumers can increase until you reach the apex predator that is effectively at the top of the food chain and is not preyed upon by other animals. There may be more than one type of apex predator in competition with each other for prey.

Scavenger

Scavengers are opportunist animals and birds that feed off the bodies of dead animals. They often begin the process of breaking down dead animals before the decomposers finish. Examples include vultures and wild dogs.

Decomposer

Decomposers are responsible for the breaking of dead animals and plants. For example, mushrooms and some insects feed on decaying matter

How Can Energy Be Produced Sustainably?

  • What is Sustainable Energy?

    • Energy that is:

      • Renewable: Comes from sources that won’t run out.

      • Low impact: Causes little harm to the environment.

      • Fair and Accessible: Can be used now and by future generations.

  • Types of Energy:

    • Fossil Fuels (oil, coal, gas):

      • Renewable?: No

      • Pros: Reliable, cheap (short term)

      • Cons: Pollutes air and water, causes climate change

    • Solar Power:

      • Renewable?: Yes

      • Pros: Clean, uses abundant sunlight

      • Cons: Expensive to install, weather dependent. Example: In Germany, solar panels are used on many homes and schools, even though the country isn’t very sunny.

    • Wind Power:

      • Renewable?: Yes

      • Pros: Clean, efficient in windy places

      • Cons: Needs open space, some visual/noise impact. Example: Denmark gets over 40% of its electricity from wind turbines and exports wind energy technology to other countries.

    • Hydropower:

      • Renewable?: Yes

      • Pros: Reliable, efficient

      • Cons: Can disrupt rivers and fish habitats. Example: The Three Gorges Dam in China is the largest hydroelectric plant in the world and powers millions of homes.

    • Geothermal:

      • Renewable?: Yes

      • Pros: Works all year, low emissions

      • Cons: Only works in certain areas. Example: Iceland uses geothermal energy from hot springs and volcanoes to heat homes and power electricity almost completely.

    • Biomass:

      • Renewable?: Yes (if managed well)

      • Pros: Reuses waste, provides fuel

      • Cons: Can cause deforestation if not regulated. Example: In Sweden, waste from forests and farms is used as biomass to heat homes and buildings during the winter.

  • Challenges of Sustainable Energy:

    • High initial costs for equipment

    • Not always available (sun, wind)

    • Requires space and planning

    • Some impact on ecosystems (e.g., wind turbines affecting birds)

  • Solutions and Strategies:

    • Government Action:

      • Invest in green energy projects

      • Create laws that limit pollution

      • Offer tax incentives for renewable energy

    • Innovation:

      • Electric cars

      • Smart grids that store energy efficiently

    • Education & Awareness:

      • Teaching people how to reduce energy use

      • Promoting energy-efficient habits (LED lights, turning off unused devices)

  • Mixed Concept Examples Linking Nature and Sustainable Energy:

    • In Costa Rica, the government protects rainforests and uses mostly renewable energy (hydro, wind, and solar), showing how nature and energy sustainability can work together.

    • In Norway, the country protects its environment and gets almost all its electricity from hydropower, helping it maintain clean air and water.

What is a Food Chain?

  • A food chain shows how energy flows from one organism to another in an ecosystem.

  • Basic Order: Producer → Primary Consumer → Secondary Consumer → Tertiary Consumer → Decomposer

Key Terms

  • Producer: A plant or algae that makes its own food using sunlight (photosynthesis). Example: Grass, phytoplankton.

  • Primary Consumer: An animal that eats producers (herbivore). Example: Rabbit, zooplankton.

  • Secondary Consumer: Eats primary consumers (carnivore or omnivore). Example: Snake, small fish.

  • Tertiary Consumer: Top predator that eats secondary consumers. Example: Hawk, shark.

  • Decomposer: Breaks down dead organisms and returns nutrients to the soil. Example: Fungi, bacteria, worms.

Example Food Chain

  • Grass → Grasshopper → Frog → Snake → Hawk

  • 🌱 ➡️ 🦗 ➡️ 🐸 ➡️ 🐍 ➡️ 🦅

    • Producer: Grass

    • Primary Consumer: Grasshopper

    • Secondary Consumer: Frog

    • Tertiary Consumer: Snake

    • Top Predator: Hawk

    • Decomposer: Fungi or bacteria in the soil after the hawk dies

Food Web

  • A food web shows many overlapping food chains in an ecosystem.

  • It’s more realistic because animals often eat more than one thing.

  • Example: In a pond food web, a frog might eat both insects and small fish, while a bird might eat frogs and worms.

Why This Matters for Sustainability

  • Every part of the food chain depends on the others.

  • Destroying producers (like plants or coral reefs) weakens the entire system.

  • Using sustainable farming and protecting habitats keeps food webs healthy.

Real-World Ecosystem Example

  • Coral Reef Food Chain: Phytoplankton → Zooplankton → Small Fish → Bigger Fish → Shark → Decomposer (Bacteria)

  • Coral reefs are one of the most diverse and productive ecosystems.

  • Overfishing or pollution can break this chain and hurt the whole ecosystem.