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Once hailed as a solution to Ethiopia's creeping desertification, a foreign tree is now spreading uncontrollably across the east African nation, threatening fragile ecosystems and the very survival of local communities.

World leaders attending a climate summit in Brazil launched a fund Thursday to save the world's forests, quickly raking in over $5 billion in pledges to reward tropical countries for not chopping down trees.

The United Nations warned Wednesday that climate change poses a threat to the world's northern forests, saying it was putting the planet's most powerful natural defence at serious risk.

At a beach near Algiers, brown algae native to the Pacific Ocean cover the golden sand,  posing a threat to ecosystems native to the area and …