Man’s Relationship with the Environment Chapter 18A Living Things as Natural Resources Man’s Relationship with the Environment

Natural Resources Usable materials that man can obtain from the physical world

Natural Resources Some are renewable Some are nonrenewable Trees Iron ore

Natural Resources Reasons for lack of resources: Political Waste

Living Things Humans rely on three types of organisms: Producers Consumers Decomposers

Agriculture The science of growing crops and livestock

Farming Caring for a concentrated group of plants or animals so that they can be used to supply human needs

Agriculture Farming Domesticated organisms Plants Animals Other organisms Domesticated organisms

Agriculture Soil Land grants Productivity Depletion of soil nutrients

Agriculture Replenishing the soil Fertilizer Certain plants Legumes Crop rotation No-till agriculture

Agriculture Herbicide-resistant varieties of crop plants

Man’s Relationship with the Environment Chapter 18B Man’s Role in the Ecosystem Man’s Relationship with the Environment

Population Growth Exponential growth Population increases by a certain percentage every unit Human population

Population Growth

Population Growth Different factors In an area: Birthrate Death rate Zero population growth In an area: Immigration Emigration

Population Growth Limiting factors Carrying capacity

Planning for the Future Doomsday ecology Abortion Euthanasia “Turning back to nature”

Planning for the Future Christian response Difficult to predict the future Earth may still be able to provide food Showing love to others

Conservation The preservation and wise use of natural resources

Planning for the Future Conservation Informed decisions Energy Fossil fuels Christians should exercise wise stewardship

Man’s Relationship with the Environment Chapter 18C Pollution Man’s Relationship with the Environment

Pollution The addition of impurities to an ecosystem

Types of Pollutants Substance Pollutant Solid, liquid, or gas that pollutes an ecosystem Biodegradable Nonbiodegradable

Types of Pollutants Energy Pollutant Any form of energy that pollutes an ecosystem Heat Light Sound Radiation

Pollutants Can affect living organisms in many ways Direct Indirect Most ecosystems can deal with small amounts of biodegradable pollutants

Water Pollution Sewage Mostly biodegradable wastes Sewage treatment facilities Primary treatment Secondary treatment Tertiary treatment

Water Pollution Nonbiodegradable chemicals More serious Can be poisonous to organisms and humans

Air Pollution A combination of liquids, gases, and small particles that collect in the atmosphere

Air Pollution Sources Carbon monoxide Forms when various fuels do not burn completely Poisonous Colorless, odorless, tasteless

Air Pollution Sources Sulfur compounds Sulfur dioxide Sulfuric acid

Air Pollution Sources Nitric oxide Gas found in auto exhaust Nitrogen dioxide Nitric acid

Air Pollution Sources Smog Combination of smoke, auto exhaust, and fog

Air Pollution Dealing with air pollution Laws Cars and trucks What can a Christian do?

Trash Solid waste materials In the past: Sanitary landfills Dumps Burn the trash Dump in oceans Sanitary landfills

Recycling To use again Only some materials are profitable to recycle Aluminum

Our goal is to use resources in a way that glorifies God. Serving God Our goal is to use resources in a way that glorifies God.