Path to zero emissions starts out easy, but gets steep

Carbon dioxide emissions from human activities must approach zero within several decades to avoid risking grave damage from the effects of climate change. This will require creativity and innovation, because some types of ...

Pollution blamed for drop in Beijing tourism

The number of tourists visiting China's capital fell by more than 14 percent in the first half of this year compared to 2012, state media reported Saturday, with air pollution blamed for the decline.