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Australia is racing to save the Great Barrier Reef. Scientists estimate 50% of the coral on this natural wonder of the world was killed over the last two years by marine heat waves caused by climate change. Scientists are now testing new techniques ranging from breeding heat resistant coral to developing sun shields and even piloting a robot submersible called the RangerBot. CNN's Ivan Watson reports.

President Donald Trump is prizing his deal-making intuition over intensive preparations as he gears up for his summit with North Korean leader Kim Jong Un next week.

Join CNN's #ZeroPlasticLunchDay campaign to fight single-use plastic waste on World Oceans Day, and watch how the world is celebrating with special events.

She was kidnapped by Salvadoran guerillas three decades ago, watched her husband be killed and forced to cook and clean for the militants. Now she can't stay in the US — because that was supporting terrorists, a court says.

Read CNN's Fast Facts about Mars exploration to learn more about missions to the Red Planet.

It is a meeting that eluded his father almost two decades ago and one which his grandfather never managed to accomplish.

President Donald Trump said Thursday he may invite North Korean leader Kim Jong Un to the United States if their meeting in Singapore next week goes well.

Sen. Rob Portman (R-OH) reacts to President Trump's personal lawyer Rudy Giuliani saying that North Korean leader Kim Jong Un "begged" for a summit between the US and North Korean leaders.

President Donald Trump's summit with North Korean dictator Kim Jong Un is poised to be the most popular action of his presidency so far, even though a new survey shows most Americans believe the eventual goal of any negotiations -- "complete, verifiable and irreversible denuclearization" -- will never happen.