Describe the impact of technology on the environment today.
Technology has increased the extraction and use of resources, transportation, manufacturing, waste, and greenhouse-gas emissions, which can harm ecosystems. However, it also helps people monitor environmental changes, improve energy efficiency, develop renewable energy, reduce pollution, conserve water, and restore habitats. Its overall effect depends on how it is designed and used.
Explain how producers, consumers, and decomposers obtain the energy they need.
Producers, such as plants and algae, capture sunlight and make food through photosynthesis. Consumers get energy by eating plants or other animals. Decomposers, such as fungi and bacteria, get energy by breaking down dead organisms and waste, returning nutrients to the environment.
Outline the levels of organization starting with the smallest, organisms.
Starting with the smallest, the levels of organization are organism, population, community, ecosystem, biome, and biosphere.
Describe how human impact on the environment can be positive or negative.
Human impacts are negative when activities cause pollution, deforestation, habitat destruction, climate change, or overuse of resources. They can be positive when people conserve habitats, restore ecosystems, plant trees, protect endangered species, recycle, or use renewable energy and sustainable practices.
Give two examples of producers and two examples of consumers.
Two examples of producers are grass and algae. Two examples of consumers are rabbits and hawks.
Explain how the loss of a plant, or producer, in an ecosystem can affect a secondary consumer.
If a plant is lost, the herbivores that depend on it may have less food and their population may decrease. As a result, secondary consumers that eat those herbivores may also lose a food source, causing their populations to decline or forcing them to compete for other prey.
Explain how human impact on the environment has changed over time.
Early human groups usually had relatively limited local impacts. Agriculture increased land clearing and water use, and the Industrial Revolution greatly increased mining, fossil-fuel use, pollution, and habitat destruction. Today, large populations and advanced technology allow humans to change environments on a global scale, while conservation and cleaner technologies can reduce some impacts.
Environmental science includes elements of other related sciences. Give 2 examples of related sciences.
Two related sciences are biology and chemistry. Other examples include geology, ecology, physics, and atmospheric science.
How has the settlement of humans in agricultural societies impacted the environment?
The development of agricultural societies led to population growth and permanent settlements, but it also caused deforestation, habitat loss, soil erosion, irrigation problems, and depletion of some resources. Farming and raising livestock also changed natural ecosystems and increased pollution in some areas.
Contrast environmental science and ecology.
Ecology is the study of how organisms interact with one another and with their physical environment. Environmental science is broader and combines ecology with fields such as chemistry, geology, physics, and social science to study environmental problems, human impacts, and possible solutions.
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