What is the key concept for this section? How have humans improved the quality of life for many people? How are humans living unsustainably? Define and give three examples of environmental degradation...

What is the key concept for this section? How have humans improved the quality of life for many people? How are humans living unsustainably? Define and give three examples of environmental degradation (or natural capital degradation). About what percentage of the earth’s natural or ecosystem services have been degraded by human activities? What is the tragedy of the commons? What are two ways to deal with this effect?