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There is no technical reason that would make the development of
cleaner engines impossible, especially for the road-graders, cat
tractors, log trucks and other machinery which operates in the
woods.  The clouds of black smoke that come from these engines do
not belong in our modern era; these machines are dinosaurs that
need to have cleaner-burning fuels, better mufflers, and standards
for lower HC and particulate emissions.  Of course, we cannot
simply throw away the existing machines; reasonable timetables and
a transition plan must be put in place to phase in a new generation
of cleaner heavy equipment for use both in cities and forests.