Don't forget to manually insert the <switch> elements!

set term svg size 2048,1536 fsize 60
set output 'Global Carbon Emissions.svg'

set border 1
set grid x lc rgb '#E0E0E0'
set grid y2 lc rgb '#C0C0C0'
set y2label 'Metric tons of Carbon/year (Billions)'
set xtics nomirror
set y2tics
unset ytics

set xrange [1800:2014]

set datafile separator ','
set key top left Left reverse

plot 'global.1751_2014.csv' using 1:($2/1000) title 'Total' lc rgb 'black' lw 10 with lines, \
        '' using 1:($4/1000) title 'Petroleum' lc rgb 'blue' lw 8 with lines, \
        '' using 1:($5/1000) title 'Coal' lc rgb 'green' lw 8 with lines, \
        '' using 1:($3/1000) title 'Natural gas' lc rgb 'red' lw 8 with lines, \
        '' using 1:($6/1000) title 'Cement production' lc rgb 'cyan' lw 8 with lines, \
        '' using 1:($7/1000) title 'Gas Flaring' lc rgb 'gray' lw 8 with lines