Portugal has proposed emission of 39Mt of carbon dioxide from 2005 to 2007 under a European Union plan on output of greenhouse gasses, according to a preliminary proposal made available on Wednesday.  The national allocation plan comes ahead of an end-March EU deadline to submit proposals on quotas for carbon dioxide emissions, believed to be a key factor in climate change.  Of Portugal’s total, the power sector would get about 27Mt and the cement sector 7Mt. The ceramics industry would have 940,000t and the paper and pulp sector 339,000t.