WASHINGTON (CNN) -- German Chancellor Angela Merkel addressed a joint meeting of Congress on Tuesday, telling U.S. lawmakers that the world needs an agreement on global warming.

""Icebergs are melting in the Arctic. In Africa, people become refugees because their environment has been destroyed,"" she said.
""We need an agreement on one objective: Global warming must not exceed 2 degrees Celsius.""
She said the agreement must be reached at the climate conference in Copenhagen, Denmark, next month.
Merkel is the first German chancellor to address a joint meeting of Congress.