Vice President Joe Biden went to a new Costco Thursday morning. There are several reasons a man who's a heartbeat away from the most powerful job in the world might spend a few minutes there.
From Seattle to Sweden, city and regional governments are using roof gardens, specially designed wetlands, and other forms of 'green infrastructure' to rein in pollution – and to save money.
Plastic bags have been taxed in Washington, D.C., since January, bringing the city nearly $1 million for river cleanup. But can a bag tax bring revenue in the long term?