Carbon dioxide is a greenhouse gas that traps heat in the Earth's atmosphere, contributing to global warming.

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.

Smog is a type of air pollution that is caused by the reaction of sunlight with pollutants in the air, such as nitrogen oxides and hydrocarbons.

Decomposition is the process by which bacteria break down organic matter into simpler substances, such as carbon dioxide and water.

Eutrophication is a type of water pollution that is caused by an excess of nutrients, such as nitrogen and phosphorus, which can lead to algal blooms and oxygen depletion.

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.

Heavy metal contamination is a type of soil pollution that is caused by the accumulation of heavy metals, such as lead, mercury, and cadmium, in the soil.

Nitrogen fixation is the process by which bacteria convert nitrogen gas into a form that can be used by plants, such as ammonia and nitrate.

Solar energy is a type of renewable energy that is generated from the sun's rays.

Denitrification is the process by which bacteria convert nitrate into nitrogen gas, which is released into the atmosphere.

Fossil fuels are a type of non-renewable energy that are formed from the remains of ancient plants and animals.

Nitrification is the process by which bacteria convert ammonia into nitrite and nitrate, which can be used by plants.

Organic farming is a type of sustainable agriculture that does not use synthetic pesticides, herbicides, or fertilizers.

Anammox is the process by which bacteria convert nitrite and ammonium into nitrogen gas, which is released into the atmosphere.

Reducing greenhouse gas emissions is a type of climate change mitigation strategy that aims to reduce the amount of greenhouse gases released into the atmosphere.