Environmental News Network: While the nation’s major air carriers fight for survival in a world of soaring jet fuel prices and concern over pollution caused by aircraft, a new business commuter carrier in the Pacific Northwest is offsetting 100 percent of its airplanes’ emissions. In June, SeaPort Airlines launched regularly scheduled service between Portland, Ore., and Seattle, with multiple departures each day. A month later, the carrier announced it would donate funds to offset all carbon emissions generated …