$(2)$ For limiting global climate temperatures to a $1\mathrm{.}5$C increase, an estimated $1\mathrm{.}4$ tonnes of CO$2$ can be emitted per person per year through $2050($based on a $400$ Gt carbon budget$).$ Using the concept of Allocation, answer the following for the U$.$S$.$ Also assume:

$-$ Currently the $28\%$ of the CO$2$ allocated per person is used for transportation by car $.$

$-$ Currently the average personal vehicle emits approximately $404$ g C $2/$mile

$-$ Currently each person drives about $9,524$ miles per year

$1.$ What is the current amount of CO$2$ emitted per person for driving personal vehicles?

$2.$ What is the allowable CO$2$ emissions rate per person per year for driving personal vehicles if we are attempting to meet these targets of $1\mathrm{.}4$ tonnes of emissions $($total$)$ per person? How far above $($or below$)$ is our current emissions rate compared to the target $($answer in g CO$2)$

a$.$

$3.$ If we kept the efficiency of our vehicles the same and assuming the same $\%$ allocation for transportation, how many miles per year could we drive per person per year and still meet these emissions targets? Is this feasible?

$4.$ If we increased the fuel efficiency of vehicles to an average of $58$ MPG $($i$.$e$.153$ g CO$2$ per mile$),$ as proposed by the EPA this year and drove $8,000$ miles per year, and only half of us drove $($the rest share with others$)$ would we meet the emissions targets $($assuming the same $\%$ allocation for transportation$)?$ How far above or below the target would we be $($in g CO$2)?$