The lake became ______ after people threw plastic bottles and waste into it.

These bags are ______, so they can break down naturally in the soil.

Too much smoke from factories is ______ to people’s health.

Some factory waste is very ______ and can kill fish and plants.

My parents buy ______ vegetables because they are grown without artificial chemicals.

Glass and paper are usually ______ because they can be made into new products.

Wind power is a ______ way to produce electricity because it does not run out easily.

Farmers should use fewer ______ pesticides to protect the soil and water.

Plastic waste is more ______ to sea animals than paper waste because animals may eat it.

A city with dirty air and unsafe water can be described as ______.

This food box is made from plants, so it is ______ and safer for the environment.

A ______ lifestyle means using resources carefully so future generations can use them too.

Some cleaning products contain ______ substances that may damage your skin.

Old newspapers are ______ because they can be turned into new paper.

The river water is not safe to drink because it contains ______ chemicals.

Using solar panels is more ______ than burning coal because it creates less pollution.

Some people prefer ______ cotton because it is grown with fewer artificial chemicals.

Throwing batteries into normal trash can be ______ because they may release dangerous substances.

The beach looked ______ after tourists left bottles, bags, and food waste everywhere.

This package is not ______, so it cannot be reused to make new materials.

Farmers grow different ______ such as rice, corn, and wheat.

Healthy ______ helps plants grow well and produce more food.

Modern ______ systems help farmers bring water to their fields during dry seasons.

Water, forests, and minerals are natural ______ that people depend on.

An ______ includes all living things and their environment.

Many countries invest in ______ to improve food production.

______ means using resources in a way that does not harm future generations.

The farm ______ grows organic vegetables is very successful.

We visited a village ______ farmers use solar-powered irrigation systems.

The machine ______ saves water was invented by a local engineer.

This is a new irrigation system ______ helps farmers during droughts.

The forest ______ is home to many rare animals must be protected.

We studied an ecosystem ______ many species depend on each other.

The project ______ aims to reduce water waste received an award.

The river ______ provides water for local farms is becoming polluted.

An eco-friendly school installed ______ to reduce its electricity bills and carbon emissions.

During a drought, farmers often use ______ because it uses much less water than traditional methods.

Garden waste such as leaves and grass can be placed in a ______ to create nutrient-rich compost.

The school garden uses a ______ to collect rainwater instead of using tap water.

Organic farms often prefer ______ because it improves the soil without harmful chemicals.

Growing corn one year and beans the next is an example of ______.