International Paper has reported solid fourth quarter results with increased margins and growth in developing markets, such as Brazil, Russia and Eastern Europe.

Full-year 2011 net earnings increased to $1.3 billion compared with $644 million in full-year 2010. In the 4Q 2011, the company reported net earnings of $257 million compared with $316 million in the 4Q 2010. Quarterly net sales were $6.4 billion in the 4Q compared with $6.5 billion in the 4Q 2010.

"Margin expansion across our global operations, as well as growth in emerging markets, contributed to a solid 4Q and drove IP's performance throughout 2011," said John Faraci, Chairman and CEO. "International Paper has consistently delivered strong results for the sixth consecutive quarter since the global downturn, generating our best financial results in nearly two decades. Sustaining positive momentum in an uneven global economy is challenging, but over the course of the full year ahead we remain confident in our ability to continue to execute at a high level."