Swiss engineers have developed a machine that removes the greenhouse gas carbon dioxide directly from the atmosphere. It works by binding CO2 on filters coated with specific chemicals, and the gas is later released for capture.
A recent report shows rising CO2 levels in the atmosphere are about to make the world's oceans uninhabitable for many sea creatures, threatening entire ocean ecosystems. What can be done?
Researchers estimate that global carbon dioxide emissions will rise around 2 percent in 2017, making it the first increase in three years. Experts warned that "time is running out" to limit the effects of climate change.
The EU Commission wants carbon dioxide emissions from cars to be reduced by 30 percent by 2030, it announced on Wednesday. Opposition has been strong, not least from the powerful German car industry.
2017 is set to be one of the hottest years ever recorded, the UN's World Meteorological Organization said at climate conference COP23. Sea levels have risen further and ice in the Antarctic moved towards a record low.
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