refers to the section from which the problem is taken$\mathrm{.}1-1.$ A large electric utility company spews $62$million tons of greenhouse gases $($mostly carbon dioxide$)$ into the environment each year. This company has committed to spending $$1\mathrm{.}2$ billion in capital over the next five years to reduce its annual emissions by $5\%.$ More will be spent after five years to reduce greenhouse gases further. $(1\mathrm{.}3)$a$.$ What is the implicit cost of a ton of greenhouse gas?b$.$ If the United States produces $3$ billion tons of greenhouse gases each year, how much capital must be spent to reduce total emissions by $3\%$ over the next five years based on your answer in Part $($a$)?$