Shipping, airlines and road transport need to clean up their emissions and help drive governments towards policies to fight global warming, a top U.N. official said on Thursday. The transport sector accounts for more than 20 percent of mankind's carbon dioxide emissions, and further growth is likely given rising demand for cars, goods and travel in developing countries. Transport will also be a key part of a broader U.N. climate pact about 190 nations will try to agree on at the end of the year during talks on a successor to the Kyoto Protocol. "There can be no doubt that the transport sector will come under intense pressure and needs to dramatically change direction," Yvo de Boer, head of the U.N. Climate Change Secretariat, told a global transport ministerial gathering in Tokyo on Thursday.

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