Reducing Carbon Emissions

The Obama administration on Friday proposed tough new standards to reduce pollution from carbon-emitting trucks and vans.

American steam trains are waging a comeback. Since 2011, engineers have been working to develop a passenger train that is cleaner, more powerful, and less expensive than the competition.

Different regions are affected differently. Across the United States, average temperatures have risen since 1901, and the warming has increased in the past 30 years. Of the top ten warmest years on record, seven were recorded since 1990.