Question

1. what is the main cause of the enhanced greenhouse effect?

a. natural volcanic activity
b. changes in earths orbit
c. increased greenhouse gas emissions from human activities
d. the natural greenhouse effect

1. what is a significant threat to marine biodiversity caused by human activities?

a. enhanced marine conservation efforts.
b. increased fish populations
c. overfishing and habitat destruction
d. natural disasters

1. what is an ethical consideration associated with environmental stewardship?

a. ignoring global collaboration
b. promoting unsustainable practices
c. prioritizing short - term profits
d. acknowledging disparities in environmental impacts

Explanation:

1. Human - caused increased greenhouse gas emissions, like carbon - dioxide from burning fossil fuels, are the main cause of the enhanced greenhouse effect. Natural volcanic activity and the natural greenhouse effect are not the main causes, and changes in Earth's orbit are a long - term climate factor not related to the enhanced greenhouse effect.
2. Overfishing reduces fish populations and habitat destruction, such as coral reef damage, are significant threats to marine biodiversity caused by human activities. Marine conservation efforts are positive, increased fish populations are not a threat, and natural disasters are not human - caused threats in this context.
3. Acknowledging disparities in environmental impacts is an ethical consideration as it addresses issues of environmental justice. Ignoring global collaboration, promoting unsustainable practices, and prioritizing short - term profits are unethical in the context of environmental stewardship.

Answer:

1. c. Increased greenhouse gas emissions from human activities
2. c. Overfishing and habitat destruction
3. d. Acknowledging disparities in environmental impacts