Answer: 1. Charities
2. Government action the only viable solution
Step-by-step explanation:
Externalities are the resultant additional effects that are experienced by others as a result of actions by an economic agent who does not bear the extra aformentioned cost or benefit that their actions bring about.
1. Private Solutions to Externalities include any solution independent of the government.
The above Private Solution is Charities because it was a Non-profit Environmental Organization that dealt with the lobbying for the reduction to be acted upon by state agents. These types of organisations are usually Charities.
2. If it is shown that the potential gains are viewed to be quite high as in this case then negotiating with the polluters might not work. In this case Government Intervention is needed to force the polluters to adhere to rules and regulations.