1. Consider a world with no pollution. Is no pollution optimal? What are some costs that come with pollution? What are some benefits that come with pollution?
2. Research any specific pollutant (e.g., carbon monoxide, sulfur oxides,noise pollution, etc.) What causes and what are the effects of the pollutant? What (if any) are some policies done to reduce the level of pollution, or what are some policies that can be done?
3. In 2009,an asteroid narrowly missed Earthhttps://cneos.jpl.nasa.gov/news/news166.html

(narrowly in astronomical terms).Another just last year. https://cneos.jpl.nasa.gov/news/news203.html

1. Whose responsibility should it be to pay for asteroid protection? If there is little profit to be had, is there an incentive for the private sector to pay?