Catalytic converters.
carbon monoxide is a rich indicator, if you are producing too much, you have a fuel system problem.
Hydro carbons, oxides of nitrogen and carbon monoxide. HC, NOx, and CO
They reduce emissions of three harmful compounds found in car exhaust: Carbon monoxide, Nitrogen oxides, and Hydrocarbons.
Cars do not have anything in their exhaust to reduce carbon monoxide. A Catalytic Convertor in the Exhaust System is used to remove Carbon Monoxide from the exhaust gasses.
If you want to reduce your carbon footprint, you can reduce your emissions of CO2 (carbon dioxide) into the atmosphere.
By its self it does not reduce carbon emissions. What it does do is provide an alternative source of energy that does not create any more carbon emissions. Though, this will only become effective when solar energy is more cost effective than carbon based energy.
Emissions from factories can be reduced by installing 'green' devices to reduce the amount of soot, carbon dioxide and other greenhouse gases. The Government can also promote the use of public transport instead of private transport so as to reduce exhaust given out by cars. Saving electricity can also reduce the amount of fossil fuels burnt, which releases carbon dioxide too.
Recycle things such as plastic so as to reduce the use of plastic.
carbon offsets
catalyitic converters reduce pollution by converting carbon monoxide into carbon dioxide which is a less harmful gas
the Coke supplies carbon monoxide to reduce the ore in a blast furnace and supplies heat to melt the iron.
Government should decrees the taxes.