During the Cold War the United States developed a new spy plane that would travel at an altitude of 70,000 feet and track the expansion of nuclear arms in the Soviet Union.
See what Chinese President Xi Jinping has proposed to the Group of 20 nations about how to safeguard our planet. Environmentalists in Pakistan are warning that a $50bn real estate project planned by the government to develop two islands in the Arabian Sea could lead to an environmental disaster.
The islands, near Karachi, are known for their mangrove forests, which provide natural cover from storms and pollution.
Prime Minister Imran Khan's government says the project will create thousands of jobs and ease pressure on Karachi, a megacity, home to 20 million people.
Al Jazeera's Priyanka Gupta reports. Investigaciones dan indicios sobre la formacion de sistemas planetarios President Trump says he will consider a special prosecutor to look into spying on his 2016 campaign.