Question

which challenge arises from trying to protect the environment?
high clean - energy startup costs
less access to clean water
lower taxes for citizens
more land available for farming

Explanation:

Clean - energy technologies often require significant initial investment for research, development, and infrastructure building, which is a major challenge in environmental protection efforts. Less access to clean water is not a direct result of environmental protection but rather a consequence of pollution or mismanagement. Lower taxes for citizens and more land available for farming are not typical challenges from environmental protection.

Answer:

high clean - energy startup costs