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One of the problems with comparing the (CONTRIBUTE) of different forms of
transport is that they all take different routes. We looked at a hypothetical journey from London
to Naples in Italy and calculated the carbon (EMIT) released into the atmosphere by
making the journey by air, land and sea.

We also considered some more (USUAL) options. Would travelling by horse actually be
carbon neutral, for example? A horse emits about 18 kg of methane a year. This is equivalent to
378 carbon units because methane is 21 times more (POWER) a greenhouse gas than
carbon dioxide.

We can calculate the total contribution by (WORK) out the number of days it would take
to make this journey and (MULTIPLY) this by the methane emitted each day.
Going on holiday by horse may appeal to cowboys, but our trip to Italy would take two months
each way. (SURPRISE), the car is the next best (CHOOSE), assuming there are
three people (SHARE) it. But for a single trip the train would be the (GREEN)
option.