This is an incidental or secondary product made in the manufacture or synthesis of something else.

This is energy that is collected from renewable resources, which are naturally replenished on a human timescale, including carbon-neutral sources like sunlight, wind, rain, tides, waves, and geothermal heat.

These are natural fuels such as coal or gas, formed in the geological past from the remains of living organisms

This is precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms. This can include rain, snow, fog, hail or even dust.

Any of the various gaseous compounds (such as carbon dioxide or methane) that absorb infrared radiation, trap heat in the atmosphere and contribute to the greenhouse effect. Examples: carbon dioxide and methane

This is the long-term change in the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

This is a science concerned with the preservation of nature, specific species, or natural resources.

This is a method of plowing furrows that follow the curves of the land rather than straight up and down slopes. Furrows that run up and down a slope form a channel that can quickly carry away seeds and topsoil.

This is the practice of planting different crops sequentially on the same plot of land to improve soil health, optimize nutrients in the soil, and combat pest and weed pressure.

This is the clearing or thinning of forests by humans.

This is achieving maximum productivity with minimum wasted effort or expense.

This is the production and discharge of something, especially gas or radiation.

To use resources to the point where they can no longer be restored.

This is a rapid flooding of low-lying areas: washes, rivers, dry lakes, and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields.

A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.

This is the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.

This is a form of electromagnetic radiation that comes from the sun.

These are resources that exist without the actions of humankind.

These are natural substances that are not replenished with the speed at which it is consumed.

This is a colorless gas that absorbs ultraviolet radiation.

These are harmful materials to the environment. ... Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories.

These are laws that protect the environment.

These are resources that can be used repeatedly and do not run out because it is naturally replaced. A renewable resource, essentially, has an endless supply such as solar energy, wind energy, and geothermal pressure.

That part of the precipitation, snowmelt, or irrigation water that appears in uncontrolled (not regulated by a dam upstream) surface streams, rivers, drains, or sewers.

The results from large amounts of fossil fuel burning in an area and is caused by a mixture of smoke and sulfur dioxide