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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 two degrees Celsius."

She said the agreement must be reached at a the climate conference in Copenhagen, Denmark, next month.

Merkel is the first German chancellor to address a joint meeting of Congress.

In a joint press conference, President Obama and German Chancellor Angela Merkel both condemned the post-election violence in Iran.

WASHINGTON (CNN) - U.S. President Barack Obama and German Chancellor Angela Merkel condemned Iran's post-election crackdown on Friday and expressed a common determination to prevent the Iranian regime from acquiring nuclear weapons.

They also underscored, among other things, a mutual commitment to a two-state solution to the Israeli-Palestinian conflict, a desire for closer economic cooperation, and a strong intention to work together on the issue of global warming.

They made their remarks during a joint appearance at the White House.

The United States and Germany "speak with one voice" in defending the rights of Iranians to assemble and have "their voices heard" in pursuit of justice," Obama said.

The Iranian government's violent post-election crackdown is "outrageous," he added. "We condemn it."

Merkel promised that the world "shall not forget" the "horrifying scenes" playing out in Tehran in recent weeks.

"Iran cannot count on the world community turning a blind eye to this," she said.

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WASHINGTON (CNN) - German Chancellor Angela Merkel will meet with President Barack Obama at the White House next week, Obama's spokesman announced Thursday.

A White House statement said the June 26 meeting would focus on "a broad agenda of global issues of mutual concern," but provided no details.

"The United States and Germany, a NATO ally, enjoy long-standing and strong bilateral relations, and partner together around the world to promote peace, prosperity and democratic freedoms," it said.