Planetary carbon dioxide concentrations are the highest they've been in the past 800,000 years, an ignominious milestone for Earth Day 2013. Still, the world is making some progress toward addressing global warming.
South Korea and the US must be skeptical about future talks, not least because North Korea has no incentive to change. However, the North is vulnerable to financial pressure, as seen when the US once sanctioned an Asian bank that handled North Korean money.
A rumor that Chinese President Xi Jinping traveled undetected among the commoners of Beijing sparked enormous interest, echoing popular lore of Chinese emperors moving about in disguise.
The world’s first ever algae-powered building is being built and tested in Hamburg, Germany, Kennedy writes. With the outer facades covered in glass panelled bioreactors the building can produce its own energy.